Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Nano-imprinted rear-side diffraction gratings for absorption enhancement in solar cells
Year:2012
Research Areas
  • Electric engineers, electronic and automatic (eil),
  • Solar cells,
  • Technology of devices for engineering
Information
Abstract
As wafer-based solar cells become thinner, light-trapping textures for absorption enhancement will gain in importance. In this work, crystalline silicon wafers were textured with wavelength-scale diffraction grating surface textures by nanoimprint lithography using interference lithography as a mastering technology. This technique allows fine-tailored nanostructures to be realized on large areas with high throughput. Solar cell precursors were fabricated, with the surface textures on the rear side, for optical absorption measurements. Large absorption enhancements are observed in the wavelength range in which the silicon wafer absorbs weakly. It is shown experimentally that bi-periodic crossed gratings perform better than uni-periodic linear gratings. Optical simulations have been made of the fabricated structures, allowing the total absorption to be decomposed into useful absorption in the silicon and parasitic absorption in the rear reflector. Using the calculated silicon absorption, promising absorbed photocurrent density enhancements have been calculated for solar cells employing the nano-textures. Finally, first results are presented of a passivation layer deposition technique that planarizes the rear reflector for the purpose of reducing the parasitic absorption.
International
Si
Congress
SPIE 8471, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion III
960
Place
San Diego, California, USA
Reviewers
Si
ISBN/ISSN
0000-000-000-000
10.1117/12.929034
Start Date
12/08/2012
End Date
16/08/2012
From page
1
To page
7
Proc. SPIE 8471
Participants
  • Autor: Alexander Virgil Mellor . (UPM)
  • Autor: H. Hauser
  • Autor: A. Guttowski
  • Autor: C. Wellens
  • Autor: B. Bläsi
  • Autor: Ignacio Tobias Galicia (UPM)
  • Autor: Antonio Marti Vega (UPM)
  • Autor: Antonio Luque Lopez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Silicio y Nuevos Conceptos para Células Solares
  • Centro o Instituto I+D+i: Instituto de Energía Solar
  • Departamento: Electrónica Física
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