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29/06/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Le rendement des cellules solaires Graetzel atteint 15% en laboratoire


Publié dans la prestigieuse revue scientifique Nature, l'équipe dirigée par l'inventeur de la cellule solaire du même nom (Graetzel) décrit un nouveau procédé de dépôt permettant de fabriquer des cellules à pigment photosensible ayant atteint en laboratoire un rendement de 15%.
Les cellules à pigment photosensible, inventées en 1991 par le Professeur Graetzel, voient ainsi leur rendement rejoindre, voire dépasser celui des cellules traditionnelles sans sacrifier la stabilité, a précisé l'EPFL dans un communiqué.

"Notre travail de recherche sur les cellules solaires à pigment photosensible aboutit - en laboratoire - à des rendements supérieurs à 15% et nos cellules - en extérieur - ont été validées avec un record du monde à 14,1%. Avec ce niveau d'efficacité, la technologie DSSCs s'avère extrêmement concurrentielle face aux cellules solaires classiques, en particulier si l'on considère que les cellules solaires à colorant n'ont pas besoin de conditions d'ensoleillement idéales pour produire de l'énergie. Dans la tâche qui consiste à faire passer cette technologie du stade de laboratoire à celui de l'industriel, nous sommes particulièrement attentifs au programme de Dyesol pour permettre un déploiement commercial dans un délai le plus court possible" a déclaré le Professeur Graetzel.

L'un des nombreux avantages de la technologie DSSCs (Dye-sensitized solar cells) par rapport aux cellules solaires classiques en silicium reste que l'énergie peut être générée même à de faibles luminosités (aube, crépuscule, conditions nuageuses, lumières artificielles, ombragées ou indirectes).

Afin d'obtenir ce rendement record pour ce type de technologie, les cellules solaires ont bénéficié à la fois de cette technique innovante et de matériaux clés comme la pâte développée par la société Dyesol : 18NR-T Titania. "Les récentes percées dans la technologie des cellules solaires à colorant sont vraiment étonnantes. C'est l'aube d'une nouvelle ère dans la production d'une énergie renouvelable efficace et abordable", a indiqué pour conclure le Président de Dyesol, Richard Caldwell.

http://www.enerzine.com/1/16054+le-r...oratoire+.html
29/06/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Citation:
Posté par Yucatan Voir le message
Le rendement des cellules solaires Graetzel atteint 15% en laboratoire


Publié dans la prestigieuse revue scientifique Nature, l'équipe dirigée par l'inventeur de la cellule solaire du même nom (Graetzel) décrit un nouveau procédé de dépôt permettant de fabriquer des cellules à pigment photosensible ayant atteint en laboratoire un rendement de 15%.
Les cellules à pigment photosensible, inventées en 1991 par le Professeur Graetzel, voient ainsi leur rendement rejoindre, voire dépasser celui des cellules traditionnelles sans sacrifier la stabilité, a précisé l'EPFL dans un communiqué.

"Notre travail de recherche sur les cellules solaires à pigment photosensible aboutit - en laboratoire - à des rendements supérieurs à 15% et nos cellules - en extérieur - ont été validées avec un record du monde à 14,1%. Avec ce niveau d'efficacité, la technologie DSSCs s'avère extrêmement concurrentielle face aux cellules solaires classiques, en particulier si l'on considère que les cellules solaires à colorant n'ont pas besoin de conditions d'ensoleillement idéales pour produire de l'énergie. Dans la tâche qui consiste à faire passer cette technologie du stade de laboratoire à celui de l'industriel, nous sommes particulièrement attentifs au programme de Dyesol pour permettre un déploiement commercial dans un délai le plus court possible" a déclaré le Professeur Graetzel.

L'un des nombreux avantages de la technologie DSSCs (Dye-sensitized solar cells) par rapport aux cellules solaires classiques en silicium reste que l'énergie peut être générée même à de faibles luminosités (aube, crépuscule, conditions nuageuses, lumières artificielles, ombragées ou indirectes).

Afin d'obtenir ce rendement record pour ce type de technologie, les cellules solaires ont bénéficié à la fois de cette technique innovante et de matériaux clés comme la pâte développée par la société Dyesol : 18NR-T Titania. "Les récentes percées dans la technologie des cellules solaires à colorant sont vraiment étonnantes. C'est l'aube d'une nouvelle ère dans la production d'une énergie renouvelable efficace et abordable", a indiqué pour conclure le Président de Dyesol, Richard Caldwell.

http://www.enerzine.com/1/16054+le-r...oratoire+.html
http://www.swissinfo.ch/fre/les-pann...ombre/38087422
29/06/2014 Vieux  
 
  40 ans, Brabant Wallon
 
DisaSolar leader du photovoltaïque organique

12/07/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Nanoparticle Breakthrough May Make Paint-On Solar a Reality Posted by Matt Power Jul 2, 2014 5:33:41 PM A new study published in Nature Materials describes a breakthrough involving Colloidal quantum dots (CQDs), tiny particles that can store solar energy. According to the research team at the University of Toronto, these nanoparticles are stable in air (unlike prevous attempts). They're inexpensive to produce, and could be mixed with other materials--even paints, and applied to building exteriors or roofing. Original article HERE. - See more at: http://www.greenbuildermedia.com/new....uhMNSVPc.dpuf



http://www.greenbuildermedia.com/new...olar-a-reality

Air-stable n-type colloidal quantum dot solids

Journal name:Nature MaterialsYear published2014
Air-stable n-type colloidal quantum dot solids
    • Colloidal quantum dots (CQDs) offer promise in flexible electronics, light sensing and energy conversion. These applications rely on rectifying junctions that require the creation of high-quality CQD solids that are controllably n-type (electron-rich) or p-type (hole-rich). Unfortunately, n-type semiconductors made using soft matter are notoriously prone to oxidation within minutes of air exposure. Here we report high-performance, air-stable n-type CQD solids. Using density functional theory we identify inorganic passivants that bind strongly to the CQD surface and repel oxidative attack. A materials processing strategy that wards off strong protic attack by polar solvents enabled the synthesis of an air-stable n-type PbS CQD solid. This material was used to build an air-processed inverted quantum junction device, which shows the highest current density from any CQD solar cell and a solar power conversion efficiency as high as 8%. We also feature the n-type CQD solid in the rapid, sensitive, and specific detection of atmospheric NO2. This work paves the way for new families of electronic devices that leverage air-stable quantum-tuned materials.

Dernière modification par Yucatan 12/07/2014 à 13h37.
22/07/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Citation:
Posté par Yucatan Voir le message
Solyndra (aussi une société plus connue qui est eteinte ):





Bankrupted Solyndra’s modules make comback in post-subsidy Europe

Solyndra.
Solyndra's proprietary technology was "disruptive" and "made sense" according to Stefan de Haan of IHS but the company was unable to cope with falling crystalline module prices.
Some of the distinctive cylindrical photovoltaic modules produced by bankrupted US thin-film manufacturer Solyndra are being resold in Europe through Photon Energy, PV Tech has learned.

Photon Energy, a PV solutions company headquartered in Holland, said that despite the lack of warranties available, customers are happy to purchase the modules due to their low price, which is becoming an increasingly decisive factor in the context of dwindling subsidies in some European countries.

Modules produced by Solyndra, which went bankrupt in September 2011 after receiving over US$500 million in funding from US government programmes started under president George W. Bush, were sold off at auction in December that year. Following its bankruptcy, the matter became a topic of controversy, with some critics holding the Obama administration, which had since come into office, responsible and ensuring Solyndra was a regular feature in the 2012 presidential election.

The company developed proprietary technology for its unique modules, which were designed to be lightweight and durable while being of comparable efficiency to other copper indium gallium selenide (CIGS) thin-film modules. Solyndra specifically targeted the commercial rooftop segment of the market. The company’s failure to compete on costs as crystalline prices plummeted in 2011 and 2012 was cited as the reason it eventually went bankrupt.

Marek Farsky, head of sales and procurement at the Czech Republic-based trading arm of at Photon Energy, said he missed the auction, but later found out that some stock was available.

“The auction was 2011 – I didn’t know anything about the auction at the time. During 2012 and 2013 I had information that there might be some Solyndra batches still here in Europe which were unsold… A lot of them were in the south of Europe, where the PV market stopped for a while – Greece, Italy, before it was Spain.”

Farsky said the modules are popular in markets, particularly in southern Europe, where subsidies have been reduced or removed entirely, due to the low prices Photon Energy is able to sell them at. He said his company has so far procured 3MW of Solyndra modules, with between 1MW and 2MW already accounted for. According to Farsky, although the goods cannot be put under warranty, Photon Energy has procured enough stock to be able to offer replacements for broken modules. He says that his Solyndra-buying customers are a mixture of those that know the modules’ history and those that don’t.

“Of course, some of them are aware of their history; however, if the price level of Solyndra we sell is substantially lower than current crystalline technology under anti-dumping provision in the EU, they consider savings [more important] than risks with warranty problems. There are no FiTs and other subsidies around in some countries/markets and if customers want to approach grid parity they turn to product which can allow it. Usually final customer is owner of middle-size industrial roofs.”

Killer costs

Stefan de Haan, associate director of solar supply chain research at IHS told PV Tech that while Solyndra had a genuinely disruptive technology that could be successfully targeted at a market segment that was traditionally “not an easy one to sell to with other technologies”, cost remained a serious problem.

“Solyndra had really a disruptive technology that made sense and was specifically targeted at commercial rooftops. It was lightweight but could carry a lot of wind load due to the design and the efficiency was in line with other CIGS approaches – they had really a unique product for a specific market segment.”

“The ‘only’ problem they had, and it’s a big problem, is that they couldn’t bring costs down. As soon as crystalline prices plummeted in 2011 and 2012 the entire PV world was turned upside down and this was the end for Solyndra. Cost killed them – they had costs above US$3 [per watt] when the rest of the industry was at US$1 so they couldn’t sell them.”

“That’s always been Solyndra’s problem that they were too expensive, now that they’re cheap, they find their market!” De Haan said. “It proves that it had potential in terms of technology, just the price was the difficult thing.”

Fellow analyst Finlay Colville, UK-based vice president of SolarBuzz, expressed a concern that over a 20 -year timeframe, the lack of warranty may become a problem, although Stefan de Haan pointed out that if the modules were priced cheaply enough and could be replaced in the short term, a customer was likely to be happy with a 10-year lifespan on a system to get “fairly decent” returns.

http://www.pv-tech.org/news/photon_e...uropean_market
31/07/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Imec lifts the hood on its record-setting PERT solar PV cell





10. July 2014 | Intersolar North America 2014, Industry & Suppliers, Top News | By: Christian Roselund
Interview: Imec (Belgium) has produced a record-setting 21.5% efficient solar PV cell using a PERT cell design, and spoke with pv magazine about this technology


PERT solar PV cell designs are based on n-type silicon wafers


Belgian research center imec has produced a 21.5% efficient solar PV cell, using passivated emitter, rear totally diffused (PERT) PV technology. This is a new record for this type of cell on an industrial, full-sized wafer, and was verified by Fraunhofer ISE CalLab

pv magazine
spoke with imec Scientific Director of Photovoltaics Jef Poortmans at Intersolar North America about this achievement, and why the institute is looking at PERT technology.
pv magazine: I'm familiar with the work that imec has done with passivated emitter rear contact (PERC) cells. Can you explain the difference between PERC and PERT?
Poortmans: imec has aso been working on PERC for 10 years, and we stopped development a half year ago. The first difference is that the PERC design that we used has always been on p-type silicon substrates. And the PERT is based on an n-type silicon substrate.
So why did we change from p-type to n-type? First of all because we are convinced that research will go to ever higher efficiencies to reach the theoretical limits of crystalline silicon, but it will be more straightforward to do that with n-type material. Most implementations by other groups put the emitter at the front using boron diffusion. That is pretty disruptive compared to what people do at this moment in their production lines, where they diffuse phosphorous at the front side, not boron. We moved the emitter to the rear side, and in this way we can keep many of the assets of the normal PERC process.
The boron emitter is made at the rear side, it is passivated by a dielectric, exactly like the PERC, and we open the dialectrical on both sides by means of laser ablation – excactly as we do for the PERC. We try for the rest to keep the process as much the same as what we do on the PERC.
There is another advantage to putting the emitter on the rear side. We are working on nickel-copper metallization, which we have proven to be reliable in our tests, but reliability is further enhanced by putting the emitter on the rear side and putting copper contacts on the front side.
All of these steps together allowed to reach 21.5% efficiency. But the story did not end there. We think we can reach 22% and maybe even slightly higher, by combining these steps with a selective emitter and a selective front surface field. But that is a different stack process.
pv magazine: What is the potential for commercializiation?
Poortmans: That is very strongly linked with the availability of n-type substrates. Many roadmaps including ITRPV predict that because we are moving to higher efficiencies, n-type silicon will be more and more preferred because it is easier to passivate and because it is more forgiving towards a number of contaminants like iron. n-type silicon is now around 5% of the total market, but we will gradually move to a situation where n-type silicon will be 30-40% of the market 5-10 years from now.

It is also for us, as an R&D institute, quite logical that we make this move towards n-type substrates. We want to be ahead of what the industry is doing.

pv magazine: How specialized is the machinery to make PERT cells as compared to PERC cells?

Poortmans: The systems that you use are essentially the same as the ones that you use for the PERC. You use phosphorous diffusion furnaces, we make copper contacts in the plating. The only difference is of course that you have to make a boron diffused emitter. And boron diffusion is a process which is characterized by a relatively large thermal budget and the removal of the BSG glass requires some adaptations of the process.

Therefore we are looking growing an epitaxial B-doped emitter on the rear side, and have already tried this approach. Our first attempts there, we achieved large-area efficiencies between 20 and 21%. But you see, the philosophy behind our move to this specific n-type structure was to keep things as much as possible the same. Because as this moment it is not easy to convince companies to make investments in new equipment. Because they first have to recover from the crisis which they have been suffering from in previous years.


pv magazine: Yes, everyone needs designs that are relatively simple and cheap.

Poortmans: There is one additional element I would like to add. In our press release we refer to the results which we have achieved by aluminum oxide surface passivation. We compared that with silicon oxide surface passivation, and we see that the aluminum oxide surface passivation gives us an initial boost of 0.3%, and the behavior under low illumination is also better.

But you could say of course that atomic layer deposition (ALD) of aluminum oxide is not yet implemented on a very large scale, but we are pretty sure that this will happen due to the spatial ALD system. ALD is equipment whereby substrates are coated very efficiently and rapidly by an atomic layer aluminum oxide. It should not be a big hurdle to commercialize this technology.

pv magazine: You mentioned earlier that you see more potential with PERT than with PERC. Is that because of the theoretical limits with p-type silicon or another factor?

Poortmans: The main thing which is driving us in the direction of n-type is the intrinsic property of n-type silicon surfaces to be more easily passivated than p-type silicon surfaces. Of course, at this moment an n-type silicon substrate is still somewhat more expensive than a p-type, but we expect that this difference will become smaller and smaller over time when more n-type silicon is being produced and the efficiency gain allows anyway some price difference.
We have made p-type PERC cells with efficiencies up to 21%, and we think that the n-PERT has an efficiency potential between 22 and 23%. So let's say, roughly speaking, with n-type silicon you gain about 1% over p-type.


Read more: http://www.pv-magazine.com/news/deta...#ixzz394fg0A8O
07/08/2014 Vieux  
 
  40 ans, Brabant Wallon
 
First Solar announces 21% efficiency for its CdTe solar cells, reports slight revenue growth

In March, First Solar announced it had achieved 17.0% conversion efficiency for a CdTe module.
© Stefano Oppo / photon-pictures.com
07.08.2014: US thin-film module manufacturer First Solar Inc. has set a new world record for the conversion efficiency of a thin-film CdTe solar cell, 21.0%. The new efficiency record, certified by the Newport Corporation's Technology and Applications Center (TAC) PV Lab, beats the previous record of 20.4%, set by First Solar in February 2014. According to First Solar, the new record was obtained using processes and materials designed for commercial-scale production at the company’s R&D center in Perrysburg, Ohio. The company reiterated its commitment to reaching a conversion efficiency of 22% for its CdTe cells in 2015. In March, First Solar announced it had achieved 17.0% conversion efficiency for a CdTe module, a new world record for a CdTe module. At the time, First Solar and GE announced a solar technology partnership in which First Solar acquired GE's CdTe solar intellectual property and secured a collaborative research partnership with GE's R&D team. In a separate development, First Solar reported that it recorded a slight revenue increase in the second quarter of this year. The company achieved net sales of $544.3 million in the quarter, up from $519.7 million in the same period last year. Net income, meanwhile, decreased to $4.5 million in the latest quarter from $33.5 million in the second quarter of 2013. Operating income also decreased year on year from $39.0 million to $1.9 million. The company said that project delays in the second quarter resulted in deferring some earnings to later in the year. First Solar, however, maintained its outlook for full fiscal year 2014. The company expects to achieve an operating income of $290 million to $340 million and a gross margin percentage of 17% to 18% for the year. © PHOTON
http://files.shareholder.com/downloads/FSLR/2912565185x0x773999/74dd85
a3-7726-4670-8451-18c72aa94ee3/FSLR_News_2014_8_5_English.pdf

http://files.shareholder.com/downloads/FSLR/2912565185x0x773989/5f8cc8
fe-7d05-4c4d-b8e8-78206cede53d/FSLR_News_2014_8_5_English.pdf

Die vollständige Pressemitteilung finden Sie auch im PHOTON-Archiv unter folgendem Link:
http://www.photon.info/newsletter/document/87552.pdf
13/08/2014 Vieux  
 
  40 ans, Brabant Wallon
 
http://www.altadevices.com/pdfs/single_cell.pdf






Staying Cool in the Sun

By admin on June 20, 2013
Alta builds highly efficient solar material. To be exact, we’ve set world records for single junction cells at 28.8% conversion efficiency and dual junction cells at 30.8% efficiency under one sun (non-concentrated light). This means that over a quarter of the light that lands on an Alta solar cell is converted into electricity. However, efficiency measurements are made in a controlled environment. We wanted to understand our true outdoor performance and asked the National Renewable Energy Laboratory (NREL) to help us.
The biggest factor that can impact true performance is temperature. When you put something out in the sun, it gets HOT. Solar panels can run up to 40°C hotter than the ambient temperature. And when the air temperature is high (like in Phoenix or Las Vegas) you start to deal with extreme heat. Silicon solar modules don’t like heat. They lose 4.0% of their performance for every 10°C of excess heat (over 25°C) due to a poor temperature coefficient. Therefore, when the sun is the brightest, and it’s 40°C outside (104°F), a silicon module will be operating at 80°C (176°F) and be generating 22% less power than its rated performance.
On the other hand, Alta Device’s solar material has much better thermal performance. In a real world experiment, NREL found that an Alta Devices solar module lost only 0.8% of performance per 10°C over 25°C, and was almost entirely offset by a different positive effect — changes in the sun’s spectrum due to water vapor in the air. If we go back to our theoretical hot day in Phoenix, while the silicon module loses 22% of its performance, the Alta module continues to operate nearly at its full rated performance number.
NREL saw another interesting effect. Not only did the Alta technology harvest more energy in these hot environments, it stayed cooler. This is because Alta’s material does a better job at converting solar energy into electricity instead of wasted heat. NREL found that the silicon module operated up to 10°C hotter in the same environment as Alta’s module. You can download the paper here: http://www.nrel.gov/docs/fy13osti/57902.pdf

- See more at: http://altadevices-blog.com/#sthash.S9g6GOO9.dpuf
13/08/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Citation:
Posté par Yucatan Voir le message
http://www.altadevices.com/pdfs/single_cell.pdf






Staying Cool in the Sun

By admin on June 20, 2013
Alta builds highly efficient solar material. To be exact, we’ve set world records for single junction cells at 28.8% conversion efficiency and dual junction cells at 30.8% efficiency under one sun (non-concentrated light). This means that over a quarter of the light that lands on an Alta solar cell is converted into electricity. However, efficiency measurements are made in a controlled environment. We wanted to understand our true outdoor performance and asked the National Renewable Energy Laboratory (NREL) to help us.
The biggest factor that can impact true performance is temperature. When you put something out in the sun, it gets HOT. Solar panels can run up to 40°C hotter than the ambient temperature. And when the air temperature is high (like in Phoenix or Las Vegas) you start to deal with extreme heat. Silicon solar modules don’t like heat. They lose 4.0% of their performance for every 10°C of excess heat (over 25°C) due to a poor temperature coefficient. Therefore, when the sun is the brightest, and it’s 40°C outside (104°F), a silicon module will be operating at 80°C (176°F) and be generating 22% less power than its rated performance.
On the other hand, Alta Device’s solar material has much better thermal performance. In a real world experiment, NREL found that an Alta Devices solar module lost only 0.8% of performance per 10°C over 25°C, and was almost entirely offset by a different positive effect — changes in the sun’s spectrum due to water vapor in the air. If we go back to our theoretical hot day in Phoenix, while the silicon module loses 22% of its performance, the Alta module continues to operate nearly at its full rated performance number.
NREL saw another interesting effect. Not only did the Alta technology harvest more energy in these hot environments, it stayed cooler. This is because Alta’s material does a better job at converting solar energy into electricity instead of wasted heat. NREL found that the silicon module operated up to 10°C hotter in the same environment as Alta’s module. You can download the paper here: http://www.nrel.gov/docs/fy13osti/57902.pdf

- See more at: http://altadevices-blog.com/#sthash.S9g6GOO9.dpuf
Hanergy Completes Acquisition of Alta Devices Plans to accelerate commercialization of the world's most efficient (30.8%) thin film solar technology

Acquisition has potential to change the way solar energy is used

BEIJING, Aug. 13, 2014 /PRNewswire/ -- Hanergy Holding Group Limited ("Hanergy", the "Company" or the "Group"), a multinational clean-energy power generator and the world's leading thin-film solar company, today announced that it has completed the acquisition of Alta Devices, whose thin film solar technology has a conversion efficiency of 30.8 percent, the highest among the solar energy technologies currently available in the world.
Chairman and CEO of Hanergy Li Hejun said, "Alta Devices' thin film solar technology allows more energy to be produced in lower light conditions than any other type of solar cell, giving it greater potential to power a wide range of mobile devices and equipment from phones to cars. It has the potential to change the way solar energy is used. This acquisition advances Hanergy's goal to become the world leader in the solar technology of the future."
Chris Norris, President and CEO of Alta Devices, said, "This successful acquisition is built upon Alta Devices' and Hanergy's shared belief that flexible, thin-film solar technology represents the future of the solar industry. The combination of our world-class solar cell R&D capability and Hanergy's technology, research and capital resources will help us further improve the performance of our technology, increase production capacity and expand applications."
Both companies' R&D teams will join forces to further develop Alta Devices' technology to serve the mobile and wearable tech market with reliable, high-efficiency solar-power solutions and applications. The acquisition will build on Hanergy's continuous efforts in recent years to enhance thin-film solar innovation, and improve the efficiency and applicability of clean energy through the integration of world-leading thin-film solar technologies.
In particular, Hanergy plans to actively expand the application of Alta Devices' products in various mobile power application areas, ranging from emergency charging of mobile phones, to the automotive sector and the Internet of Things.
Alta Devices' use of gallium arsenide (GaAs) allows its dual- and single-junction solar cells to produce record-breaking conversion efficiencies of 30.8 percent and 28.8 percent respectively, as certified by the U.S. National Renewable Energy Laboratory (NREL).
On a same surface area basis, its cells produce a power output two to three times higher than standard flexible thin-film cells, 8 percent higher than mass-produced monocrystalline silicon cells, and 10 percent higher than multicrystalline silicon cells.
Alta Devices' single-junction GaAs thin-film solar cells are already in production. Following the acquisition, Alta Devices will continue to operate independently as a wholly-owned subsidiary of Hanergy. Hanergy will also work with Alta Devices to develop international markets and enhance its cooperation with key strategic customers.
In recognition of its uniquely innovative combination of high technology and energy, in 2014 Hanergy was the only Chinese energy company named among the "World's Smartest Companies" by the MIT Technology Review, the world's longest-running technology industry publication. In 2012 and 2013, the same publication named Alta Devices among the "World's Most Disruptive Companies."
About Hanergy Holding Group
Hanergy Holding Group is a global clean-energy power generation company and the world's leading thin-film PV company and solutions provider. Founded in Beijing in 1994, the Company has operations across China, the Asia Pacific, North America, Europe and Africa. Hanergy is engaged in hydroelectric, wind and solar power generation.
About Alta Devices
Alta Devices holds world records for both cell and module conversion efficiency. It delivers the world's most efficient, thin and flexible mobile power technology. Converting light into electricity, Alta's technology extends the energy source of a system, and in many cases, completely cuts the traditional power cord. The solution can be completely integrated into the final system, and is ideal for use in consumer electronics, automotive, remote exploration, or anywhere size, weight, and mobility matter.
Wang Dan Ning
+8613671129766
wangdanning@hanergy.com

SOURCE Hanergy Holding Group Ltd.

http://www.prnewswire.com/news-relea...271048851.html

Dernière modification par Yucatan 13/08/2014 à 22h29.
01/09/2014 Vieux  
 
  40 ans, Brabant Wallon
 
New process could increase solar-cell efficiency 30%

By Ker Than
Inside ScienceAugust 4, 2014
2014-08-04T19:15:51Z
By Ker Than
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Most commercial-grade solar panels, have an efficiency of 20 to 25 percent; the singlet fission process could boost it an additional 30 percent.
STEEVITHAK VIA FLICKR



Scientists looking to boost the efficiency of solar panels are taking a fresh look at an exotic physics phenomenon first observed nearly 50 years ago in glowing crystals.
Called singlet fission, the process can enable a single photon of light to generate two electrons instead of just one. This 1-to-2 conversion, as the process is known, has the potential to boost solar cell efficiency by as much as 30 percent above current levels, according to a new paper published in the Journal of Physical Chemistry Letters.
Singlet fission “was originally proposed to explain some weird results that were observed in fluorescent organic crystals,” said the study’s first author, Christopher Bardeen, a chemist at the University of California, Riverside. “It received a lot of attention in the 1960s and 1970s, but then it was mostly forgotten.”
But around 2006, Bardeen and other scientists exploring new ways to boost the solar-energy conversion rates of photovoltaic panels began taking a renewed interest in singlet fission. In recent years, experiments conducted by Bardeen’s group not only helped confirm that the phenomenon is real, but also that it can be highly efficient in a variety of materials.
The hope is that singlet fission materials can be incorporated into solar panels to increase their energy conversion efficiency – the ratio of electrons produced to the amount of photons absorbed – beyond the current theoretical ceiling of approximately 32 percent, which is called the “Shockley-Queisser Limit.”
“The efficiency of most commercial-grade PV panels, like the ones you would install on your house, are around 20 to 25 percent,” Bardeen said.
Engineers have managed to overcome the Shockley-Queisser Limit through clever engineering to boost the efficiency of photovoltaic (PV) panels up to 50 percent. One technology, called multijunction solar cells, involves combining two or more semiconductor panels. But such technologies are currently limited mostly to military and space applications due to their high costs.
“It may be possible to find a way to make (multijunction cells) cheaply. … Some companies are trying to do this, but without much impact so far,” Bardeen said.
Many scientists believe the only way the next wave, or third generation, of photovoltaic technology will surpass the Shockley-Queisser Limit while remaining inexpensive is if they make use of physical processes such as singlet fission.
“First-generation solar cells were based on silicon, and they were efficient but expensive. The second generation cost much less and was based on thin-film technology. The goal of the third generation is to keep cost down but get efficiency as high as possible,” Bardeen said.
Currently, solar cells work by absorbing a photon and generating an exciton – a bound electron with a negative charge and a positively charged “hole” – which subsequently separates into an electron-hole pair. The electrons are then harnessed as electricity. In singlet fission, however, some photons – those with higher energy – get converted into two excitons, each of which can split to yield two electrons. Bardeen’s team estimates that singlet fission can boost efficiency of solar cells by up to 30 percent, resulting in a maximum efficiency of above 40 percent instead of the current 32 percent.
Experts predict that it could be another five to 10 years before solar panels based on singlet fission technology are ready for commercial use. Before that can happen, scientists will need to gain a much better understanding of how singlet fission works, said Josef Michl, a photophysicist at the University of Colorado, Boulder, who helped revive interest in singlet fission several years ago. At the moment, the main challenge for researchers trying to create a singlet fission solar panel is “a thorough understanding of the underlying physics that should allow chemists to come up with more practical materials than the few that we now know to work well in the laboratory,” said Michl, who was not involved in the study.
Michl called Bardeen’s group a “key player” in the worldwide effort to develop the technology, and said that that team’s experimental work has helped singlet fission shed its “reputation of an obscure and inefficient phenomenon.”
The other primary hurdle toward a functional singlet fission solar panel will be one of engineering, Bardeen said. Once more materials that can undergo singlet fission are developed, they will still need to be incorporated into photovoltaic cells to convert solar energy into electricity. Researchers led by Marc Baldo at the Massachusetts Institute of Technology recently reported that they had proven that it was possible to create a solar panel that uses singlet fission, but the efficiency of their device was only 2 to 3 percent.

“Baldo’s group showed that it could be done,” Bardeen said, “but nobody’s going to be putting those on rooftops tomorrow.”

http://www.newsobserver.com/2014/08/...ase-solar.html
12/09/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Hitachi Chemical's wavelength conversion particles increase cell efficiency
09. SEPTEMBER 2014 BY: EDGAR MEZA

The Japanese company says its wavelength conversion particles for solar encapsulant sheets improves power generation efficiency up to 2.2% over conventional products.



Hitachi Chemical announced on Monday that it would begin sales of its wavelength conversion particles for solar encapsulant sheets that help increase the conversion efficiency of solar cell power generation.

While solar cell power generation is increasing in popularity around the world, the company said PV systems still faced major issues where the level of power generation is affected by the amount and time of sunshine. "Manufacturers of solar cells and materials are concentrating their efforts on addressing the issue of how to improve conversion efficiency by increasing power generation from a limited amount of sunlight," the company added.

Hitachi Chemical said its wavelength conversion particles for solar encapsulants help increase power generation conversion efficiency. The group has now established a mass-production system to begin sales.

The wavelength conversion particles consist of phosphors contained within acrylic resin particles and work by converting short wavelength light (ultraviolet light), which could not previously be used for power generation, into long wavelength light (visible light). Solar cell modules that use solar encapsulant sheets (wavelength conversion film) made of these particles are expected to increase conversion efficiency by up to around 2.2% when compared with solar cell modules using conventional solar encapsulants in outdoor tests.

The particles are also dispersed throughout acrylic resin with outstanding durability, which means that the durability of solar cell modules is unaffected.

Module manufacturers do not have to alter the manufacturing process to mix the particles into solar encapsulant sheets, the company said, adding that the process contributes to an increase in conversion efficiency without affecting productivity.

In addition to solar cells, the technology can be adopted to add new functionality to counterfeiting protection, identification of authenticity, optical materials and other applications through the use of wavelength conversion, the group added.



Read more: http://www.pv-magazine.com/news/deta...#ixzz3D85vrdw7

Dernière modification par Yucatan 12/09/2014 à 22h36.
12/09/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Oxford PV announces new thin-film perovskite technology for solar applications

Oxford Photovoltaics Ltd., which was spun off of Oxford University in 2010, has developed a new application for its thin-film perovskite technology that could help manufacturers increase the absolute conversion efficiency of crystalline silicon solar cells by 3% to 5%. Over the last two years of R&D, the company has used the technology to create a standalone silicon solar cell with a conversion efficiency of over 17%. The company believes the technology could result in conversion efficiencies in the high twenties in »a relatively short period of time.« »Perovskite has the potential to change the solar industry,« said Kevin Arthur, Oxford PV co-founder and CEO. »Simply put, the material delivers very high performance at a low cost. Applied as a tandem layer, perovskite can have a significant impact by 'turbo boosting' the efficiencies of current mainstream crystalline-silicon products. We're really just scratching the surface now, given the rich potential of this material for a range of solar applications in the longer term.« Oxford PV expects to see prototype PV panels using its perovskite technology in 2015. © PHOTON

http://www.photon.info/photon_news_d...hoton?id=88261
27/09/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Airlight Energy and IBM Bring Solar Electricity and Heat to Remote Locations

(Airligth Energy et IBM produit de l'énergie thermique et électrique provenant du soleil dans les regions reculées)
Leur nouvelle machine permet de concentrer 2000 x la puissance du soleil et d'avoir un rendement de 80% de récupération de l'énergie solaire.



http://www.zurich.ibm.com/news/14/dsolar.html

Dernière modification par Yucatan 27/09/2014 à 13h22.
27/09/2014 Vieux  
 
  40 ans, Brabant Wallon
 
JA Solar breaks 20% barrier with new multicrystalline silicon PV cell
(JA Solar dépasse la barrière de 20 % de rendement pour ses nouvelle cellules polycrystaline commercialisé en 2015)


26. September 2014
By: Christian Roselund
The Chinese PV cell maker credits “proprietary light trapping and surface passivation technologies” for its world record cell. NPD Solarbuzz says this is part of a breakthrough into higher efficiencies for multicrystalline silicon PV.


Read more: http://www.pv-magazine.com/news/deta...#ixzz3EVhb8qq5
27/09/2014 Vieux  
 
  66 ans, Hainaut
 
Quand le marché est mort... c'est normal que les boîtes croulent!

Une innovation comme celle-là peut très bien marcher avec une production importante... et donc une demande en conséquence.

Combien de projets sont oubliés... depuis qu'il y a assez de PV aux yeux de nos dirigeants?

On peut le répéter mille fois... le soutien au PV a été mal géré... un véritable fiasco...
On pouvait faire beaucoup plus avec moins d'argent mais pour cela, il fallait un Ministre compétent... pas un con pétant ( ) Et dire qu'il s'est mis premier de liste afin de survivre!... mais cela ne nous regarde pas.
27/09/2014 Vieux  
 
  40 ans, Brabant Wallon
 
Citation:
Posté par seiran76 Voir le message
Quand le marché est mort... c'est normal que les boîtes croulent!

Une innovation comme celle-là peut très bien marcher avec une production importante... et donc une demande en conséquence.

Combien de projets sont oubliés... depuis qu'il y a assez de PV aux yeux de nos dirigeants?

On peut le répéter mille fois... le soutien au PV a été mal géré... un véritable fiasco...
On pouvait faire beaucoup plus avec moins d'argent mais pour cela, il fallait un Ministre compétent... pas un con pétant ( ) Et dire qu'il s'est mis premier de liste afin de survivre!... mais cela ne nous regarde pas.
La politique et la recherche scientifique sont des mondes totalement différents... Heureusement que certains industriels et pays (Allemagne, Chine, USA) permettent de développer ces technologies et promouvoient cette recherche.

En Belgique, il y a "IMEC" qui est réputé mondialement dans la recherche et développement du solaire photovoltaique... Petit pays,peu de resource, mais bcp d'idées.
27/09/2014 Vieux  
 
  40 ans, Brabant Wallon
 
  • Hitachi Chemical's wavelength conversion particles increase cell efficiency
09. September 2014 By: Edgar Meza

The Japanese company says its wavelength conversion particles for solar encapsulant sheets improves power generation efficiency up to 2.2% over conventional products.

(Hitachi Chemical permet d'augmenter l'efficience des modules PV traditionnel de plus de 2.2% grâce à leur nouvelle technologie de feuille d'encapsulation de cellules PV)
=> la plus part des modules sortant l'année prochaine auront un rendement proche voir supérieur à 20% de rendement.


Read more: http://www.pv-magazine.com/news/deta...#ixzz3EVlxoMF5

Dernière modification par Yucatan 27/09/2014 à 13h46.
29/09/2014 Vieux  
 
  45 ans, Liège
 
A Namurois produces electricity with mustard
26-09-2014 09:08 - L'Avenir
(Un Namurois produite de l'électricité avec de la moutarde)

Read more:http://m.lavenir.net/cnt/DMF20140925_00533687



Je te parodie Yucatan, mais en toute sympathie .

J'apprécie ta nouvelle façon de poster, pour moi, tu peux continuer comme ça
(un titre, une ch'tite traduction en français, un lien).
15/01/2015 Vieux  
 
  40 ans, Brabant Wallon
 
Imec announces 22.02% efficiency for n-type PERT crystalline silicon solar cell

Compared to p-type silicon solar cells, n-type cells do not suffer from light induced degradation and feature a higher tolerance to common metal impurities.

15.01.2015: Belgian nanoelectronics research institute Imec announced that it has achieved a conversion efficiency of 22.02% for a large area n-type PERT (passivated emitter, rear totally diffused) crystalline silicon solar cell on 6” commercially available n-type Cz-Si wafers. The result, recorded at the Fraunhofer ISE CalLab, is the highest efficiency achieved for this type of 2-side-contacted solar cell on an industrial large area wafer size. Compared to p-type silicon solar cells, n-type cells do not suffer from light induced degradation and feature a higher tolerance to common metal impurities. As a result, n-type silicon solar cells are considered promising alternatives to p-type solar cells for next generation highly efficient solar cells. To achieve the new efficiency record, Imec used an open-circuit voltage of 684 mV, a short-circuit current of 39.9 mA/cm2 and 80.7% fill factor. Efficiency improvements were obtained by the introduction of a selective front surface field through laser doping, giving a boost in open circuit voltage and short circuit current, the institute said. Imec’s n-PERT silicon solar cells feature Ni/Cu/Ag front contacts, applied using an industrial plating tool from Meco, and rear local contacts obtained by laser ablation of the rear passivation stack and subsequent metallization. The rear passivation stack includes a <10 nm-thin atomic-layer-deposited Al2O3 layer, deposited with the spatial ALD technique InPassion Lab from SoLayTec. The diffused front surface field and rear emitter as well as the antireflective coating are applied in a Tempress batch-type furnace. © PHOTON
http://www.imec.be

http://www2.imec.be/be_en/press/imec...olar-cell.html
21/01/2015 Vieux  
 
  72 ans, Liège
 
Pour suivre " plus vu de message depuis plusieurs jours "

Projet Photovoltaique ?
Plus dinfo!
Découvrez DAUVISTER

(Ce lien ouvre une nouvelle fenêtre, sans quitter ce site.)

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