Memorias de investigación
Ponencias en congresos:
Nano-imprinted rear-side diffraction gratings for absorption enhancement in solar cells
Año:2012
Áreas de investigación
  • Ingeniería eléctrica, electrónica y automática,
  • Células solares,
  • Tecnología de dispositivos para ingeniería eléctrica y electrónica
Datos
Descripción
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.
Internacional
Si
Nombre congreso
SPIE 8471, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion III
Tipo de participación
960
Lugar del congreso
San Diego, California, USA
Revisores
Si
ISBN o ISSN
0000-000-000-000
DOI
10.1117/12.929034
Fecha inicio congreso
12/08/2012
Fecha fin congreso
16/08/2012
Desde la página
1
Hasta la página
7
Título de las actas
Proc. SPIE 8471
Esta actividad pertenece a memorias de investigación
Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Silicio y Nuevos Conceptos para Células Solares
  • Centro o Instituto I+D+i: Instituto de Energía Solar
  • Departamento: Electrónica Física