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Light trapping with titanium dioxide diffraction gratings fabricated by nanoimprinting

Wang, Er-Chien, Mokkapati, Sudha, White, Tom P., Soderstrom, Thomas, Varlamov, Sergey and Catchpole, Kylie R. 2014. Light trapping with titanium dioxide diffraction gratings fabricated by nanoimprinting. Progress in Photovoltaics: Research and Applications 22 (5) , pp. 587-592. 10.1002/pip.2294

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Dielectric scattering structures are a promising way of trapping light in solar cells. Titanium dioxide is a particularly attractive candidate material because of its high refractive index and ability to be deposited on a finished solar cell. Here, we present an experimental demonstration of photocurrent enhancement in thin film recrystallised silicon solar cells using TiO2 pillar arrays fabricated on the rear of the cells using nanoimprint lithography. A short circuit current enhancement of 19% is measured experimentally, and excellent agreement with numerical simulations is obtained. We show numerically that by replacing the Ag capping present on the cells with a detached rear Ag back reflector, the enhancement could reach 37%. Copyright © 2012 John Wiley & Sons, Ltd.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Wiley
ISSN: 1062-7995
Date of Acceptance: 27 August 2012
Last Modified: 23 Jan 2020 04:15

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