Nanotechnology Now





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Renewable energy - The tarte tatin throws a new light on photovoltaics

Layers of zinc oxide seen through an electron microscope. On the left: natural pyramid structure; on the right: structure when grown on a mould (height of images: 5 microns). © PV-LAB, EPFL/SNSF Copies or offprints must include the author’s name and may not be used for commercial purposes
Layers of zinc oxide seen through an electron microscope. On the left: natural pyramid structure; on the right: structure when grown on a mould (height of images: 5 microns). © PV-LAB, EPFL/SNSF Copies or offprints must include the author’s name and may not be used for commercial purposes

Abstract:
Do better with less. That is the challenge the researchers of the Swiss Federal Institute of Technology in Lausanne (EPFL) have set for themselves, supported by the Swiss National Science Foundation and the Federal Office of Energy. Their specialty: manufacturing solar cells that are one thousand times thinner than conventional cells. In order to boost the output of the cells, they have developed a new nanopatterning technique.

Renewable energy - The tarte tatin throws a new light on photovoltaics

Switzerland | Posted on September 9th, 2011

Even though silicon is one of the most abundant elements, the energy required to make silicon from sand is immense. It is for this reason, but also to reduce manufacturing costs, that Professor Christophe Ballif and his team from the Photovoltaics and Thin-Film Electronics Laboratory at the EPFL have been working for several years on thin-film silicon solar cells that are a thousand times thinner than conventional cells.

Better light absorption
There's just one catch: the thinner the cells, the less they absorb the rays of the sun and the less electricity they produce. So researchers are trying to trap light in the thin silicon layers to increase their absorption. Traditionally, thin layers of zinc oxide—a material that is very abundant, completely non-toxic, and that grows in the form of small pyramid-shaped crystals—are used for this purpose. These crystals scatter light efficiently into the underlying silicon layer. With such zinc oxide layers, even a new world record cell efficiency was achieved.

Reducing costs

But scientists are attempting to beat this record. "It is difficult to modify the natural pyramidal shape of these crystals in order to obtain even better light scattering," explains researcher Corsin Battaglia, "so we had the idea to force the crystals to grow on a different support, an inverted mould with the desired structure." The idea is as ingenious as it is simple. Once the thin layer of zinc oxide is deposited on the mould all that needs to be done is to "demould" it—as you would a tarte tatin, for example—to obtain a film with the desired structure. This procedure, described in the September edition of the journal Nature Photonics, not only increases the amount of light that is trapped, thereby increasing output, but it also has the potential to reduce the cost of the cells because of its compatibility with mass production. These are interesting arguments at a time when photovoltaics is seeking to produce electricity at a lower price than the current grid price.

Full bibliographic informationCorsin Battaglia, Jordi Escarré, Karin Söderström, Mathieu Charrière, Matthieu Despeisse, Franz-Josef Haug and Christophe Ballif (2011). Nanomoulding of transparent zinc oxide electrodes for efficient light trapping in solar cells. Nature Photonics online. doi: 10.1038/NPHOTON.2011.198, (available in PDF format from the SNSF; e-mail:

####

For more information, please click here

Contacts:
Philippe Trinchan
+41 (0)31 3082222


Dr. Corsin Battaglia
Swiss Federal Institute of Technology, Lausanne
Photovoltaics and Thin-Film Electronics Laboratory
Institute of Microtechnology
Rue A.-L. Breguet 2
CH-2000 Neuchâtel
Tel.: +41 (0)32 718 33 34
E-mail:
Internet: http://pvlab.epfl.ch

Copyright © AlphaGalileo

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Researchers develop new way to manufacture nanofibers May 21st, 2015

Nanotherapy effective in mice with multiple myeloma May 21st, 2015

Turn that defect upside down: Twin boundaries in lithium-ion batteries May 21st, 2015

INSIDDE: Uncovering the real history of art using a graphene scanner May 21st, 2015

Govt.-Legislation/Regulation/Funding/Policy

Nanotherapy effective in mice with multiple myeloma May 21st, 2015

Turn that defect upside down: Twin boundaries in lithium-ion batteries May 21st, 2015

INSIDDE: Uncovering the real history of art using a graphene scanner May 21st, 2015

SUNY Poly CNSE and NIOSH Launch Federal Nano Health and Safety Consortium: May 20th, 2015

Discoveries

Simulations predict flat liquid May 21st, 2015

Researchers develop new way to manufacture nanofibers May 21st, 2015

Nanotherapy effective in mice with multiple myeloma May 21st, 2015

Turn that defect upside down: Twin boundaries in lithium-ion batteries May 21st, 2015

Announcements

Researchers develop new way to manufacture nanofibers May 21st, 2015

Nanotherapy effective in mice with multiple myeloma May 21st, 2015

Turn that defect upside down: Twin boundaries in lithium-ion batteries May 21st, 2015

INSIDDE: Uncovering the real history of art using a graphene scanner May 21st, 2015

Energy

Sandia researchers first to measure thermoelectric behavior by 'Tinkertoy' materials May 20th, 2015

Industrial Nanotech, Inc. Announces Official Launch of the Eagle Platinum Tile™ May 19th, 2015

FEI and Weatherford Enter Into Joint Agreement for Advanced Reservoir Characterization Services May 18th, 2015

Efficiency record for black silicon solar cells jumps to 22.1 percent: Aalto University's researchers improved their previous record by over 3 absolute percents in cooperation with Universitat Politècnica de Catalunya May 18th, 2015

Solar/Photovoltaic

Efficiency record for black silicon solar cells jumps to 22.1 percent: Aalto University's researchers improved their previous record by over 3 absolute percents in cooperation with Universitat Politècnica de Catalunya May 18th, 2015

Wearables may get boost from boron-infused graphene: Rice U. researchers flex muscle of laser-written microsupercapacitors May 18th, 2015

Random nanowire configurations increase conductivity over heavily ordered configurations May 16th, 2015

ORNL demonstrates first large-scale graphene fabrication May 14th, 2015

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project