Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Nano-imprinted photonic structures improve efficiency of silicon solar cells

nanoimprinted_solarcells.jpg: (left) Cross section SEM of the 2D periodic photonic nanostructures, (right) 1-Ám-thin crystalline silicon solar cells on glass including the 2D periodic photonic nanostructures with obvious diffraction of light.
nanoimprinted_solarcells.jpg: (left) Cross section SEM of the 2D periodic photonic nanostructures, (right) 1-Ám-thin crystalline silicon solar cells on glass including the 2D periodic photonic nanostructures with obvious diffraction of light.

Abstract:
Imec has successfully fabricated crystalline silicon (c-Si) solar cells including 2D periodic photonic nanostructures made with nano-imprint lithography. The result was an improvement in energy-conversion efficiency, compared to unpatterned cells, through a better absorption of the light spectrum. The technique shows a path to further reducing the thickness of solar cells while keeping the efficiency as high as possible.

Nano-imprinted photonic structures improve efficiency of silicon solar cells

Leuven, Belgium | Posted on March 16th, 2012

The reduction of the silicon wafer thickness from 150μm to 50μm and below is potentially the best way to decrease the cost of solar cells. At imec, we pursue this path through ultrathin-film crystalline silicon technologies. However, if thinner photoactive layers are used, the optical absorption is significantly reduced. This is especially so at the near-infrared region of the solar spectrum. A photon with a wavelength of 1μm needs an absorption depth as deep as 100μm. Losing this part of the spectrum reduces the overall conversion efficiency of the cells.

Recently, the field of photonics has come up with methods to manipulate light through specific structures that are smaller than the wavelengths. This makes it possible to use periodic photonic nanostructures to affect the motion of photons in a similar way as the periodicity of atoms in a semiconductor crystal affects the motion of electrons. But to do so, we need efficient patterning techniques with nanometer-scale resolution.

At imec, we used nano-imprint lithography to fabricate 2D periodic photonic nanostructures. Nano-imprint lithography is a recent top-down approach for fabricating nanometer-scale patterns. It is one of the best candidates to improve the light absorption while maintaining an acceptable manufacturing cost, but it is currently barely used for c-Si PV applications. The patterning is performed by direct deformation of the resist material through mechanical pressure and a subsequent etching step.

Compared to the standard solar cell texturing by wet-etching, subwavelength patterning using nano-imprint lithography has some advantages. First, there is less material waste upon etching (less than a micron is consumed) compared to the state-of-the-art texturing, where 5-10 microns are lost. And second, diffraction and scattering of light is possible at higher angles due to the dimensions of the nanopattern.

####

For more information, please click here

Contacts:
Barbara Kalkis
Maestro Marketing & PR

Copyright © IMEC

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

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

New research points to graphene as a flexible, low-cost touchscreen solution September 19th, 2014

Discoveries

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

New research points to graphene as a flexible, low-cost touchscreen solution September 19th, 2014

CiQUS researchers design an artificial nose to detect DNA differentiation with single nucleotide resolution September 18th, 2014

Big Results Require Big Ambitions: Three young UCSB faculty receive CAREER awards from the National Science Foundation September 18th, 2014

Announcements

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

New research points to graphene as a flexible, low-cost touchscreen solution September 19th, 2014

Energy

IEEE International Electron Devices Meeting To Celebrate 60th Anniversary as The Leading Technical Conference for Advanced Semiconductor Devices September 18th, 2014

Rice rolls 'neat' nanotube fibers: Rice University researchers' acid-free approach leads to strong conductive carbon threads September 15th, 2014

Simple, Cost-Effective Method Proposed for Synthesizing Zinc Oxide Nanopigments September 15th, 2014

UT Arlington research uses nanotechnology to help cool electrons with no external sources September 11th, 2014

Photonics/Optics/Lasers

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

The Pocket Project will develop a low-cost and accurate point-of-care test to diagnose Tuberculosis: ICN2 holds a follow-up meeting of the Project on September 18th - 19th September 18th, 2014

'Squid skin' metamaterials project yields vivid color display: Rice lab creates RGB color display technology with aluminum nanorods September 15th, 2014

Fonon at Cutting-Edge of 3D Military Printing: Live-Combat Scenarios Could See a Decisive Advantage with 3D Printing September 15th, 2014

Alliances/Partnerships/Distributorships

IEEE International Electron Devices Meeting To Celebrate 60th Anniversary as The Leading Technical Conference for Advanced Semiconductor Devices September 18th, 2014

Biosensors Get a Boost from Graphene Partnership: $5 Million Investment Supports Dozens of Jobs and Development of 300mm Fabrication Process and Wafer Transfer Facility September 18th, 2014

Toward making lithium-sulfur batteries a commercial reality for a bigger energy punch September 17th, 2014

NEI Corporation and PneumatiCoat Technologies Sign Agreement to Jointly Develop and Market New Materials for Lithium-ion Batteries September 12th, 2014

Solar/Photovoltaic

Simple, Cost-Effective Method Proposed for Synthesizing Zinc Oxide Nanopigments September 15th, 2014

Indium/Copper Sulfide Compound Semi-Conductor Synthesized through New Method September 8th, 2014

Material development on the nanoscale: Doped graphene nanoribbons with potential September 8th, 2014

Layered graphene sandwich for next generation electronics September 8th, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE