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Proceedings Paper

Tailoring randomly rough textures for light trapping in thin-film solar cells
Author(s): Piotr Kowalczewski; Angelo Bozzola; Marco Liscidini; Lucio Claudio Andreani
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Paper Abstract

In this contribution, we use a rigorous electro-optical model to study randomly rough crystalline silicon solar cells with the absorber thickness ranging from 1 to 100 μm. We demonstrate a significant efficiency enhancement, particularly strong for thin cells. We estimate the “region of interest” for thin-film photovoltaics, namely the thickness range for which the energy conversion efficiency reaches maximum. This optimal thickness results from the opposite trends of current and voltage as a function of the absorber thickness. Finally, we focus on surface recombination. In our design, the cell efficiency is limited by recombination at the rear (silicon absorber/back reflector) interface, and therefore engineering the front surface to a large extent does not reduce the efficiency. The presented model of roughness adds a significant functionality to previous approaches, for it allows performing rigorous calculations at a much reduced computational cost.

Paper Details

Date Published: 15 May 2014
PDF: 6 pages
Proc. SPIE 9140, Photonics for Solar Energy Systems V, 91400N (15 May 2014); doi: 10.1117/12.2051821
Show Author Affiliations
Piotr Kowalczewski, Univ. degli Studi di Pavia (Italy)
Angelo Bozzola, Univ. degli Studi di Pavia (Italy)
Marco Liscidini, Univ. degli Studi di Pavia (Italy)
Lucio Claudio Andreani, Univ. degli Studi di Pavia (Italy)

Published in SPIE Proceedings Vol. 9140:
Photonics for Solar Energy Systems V
Ralf B. Wehrspohn; Andreas Gombert, Editor(s)

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