Nano-imprinted rear-side diffraction gratings for absorption enhancement in solar cells

Mellor Null, Alexander Virgil and Hauser, Hubert and Guttowski, Aron and Wellens, Christine and Bläsi, Benedikt and Tobías Galicia, Ignacio and Martí Vega, Antonio and Luque López, Antonio (2012). Nano-imprinted rear-side diffraction gratings for absorption enhancement in solar cells. In: "Proceedings of SPIE. Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion III", 12/08/2012 - 16/08/2012, San Diego, California, USA. pp. 1-7. https://doi.org/10.1117/12.929034.

Description

Title: Nano-imprinted rear-side diffraction gratings for absorption enhancement in solar cells
Author/s:
  • Mellor Null, Alexander Virgil
  • Hauser, Hubert
  • Guttowski, Aron
  • Wellens, Christine
  • Bläsi, Benedikt
  • Tobías Galicia, Ignacio
  • Martí Vega, Antonio
  • Luque López, Antonio
Item Type: Presentation at Congress or Conference (Article)
Event Title: Proceedings of SPIE. Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion III
Event Dates: 12/08/2012 - 16/08/2012
Event Location: San Diego, California, USA
Title of Book: Proceedings of SPIE. Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion III
Date: 2012
Volume: 8471
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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.

More information

Item ID: 19795
DC Identifier: http://oa.upm.es/19795/
OAI Identifier: oai:oa.upm.es:19795
DOI: 10.1117/12.929034
Official URL: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1379754
Deposited by: Memoria Investigacion
Deposited on: 17 Sep 2013 18:58
Last Modified: 21 Apr 2016 21:16
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