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Optical Engineering

Optimal design of laterally assembled hexagonal silicon nanowires for broadband absorption enhancement in ultrathin solar cells
Author(s): Mojtaba Shahraki; Mohammad Reza Salehi; Ebrahim Abiri
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Paper Abstract

Design approaches to carry out broadband absorption in laterally assembled hexagonal silicon nanowire (NW) solar cells are investigated. Two different methods are proposed to improve the current density of silicon NW solar cells. It is observed that the key to the broadband absorption is disorder and irregularity. The first approach to reach the broadband absorption is using multiple NWs with different geometries. Nevertheless, the maximum enhancement is obtained by introducing irregular NWs. They can support more cavity modes, while scattering by NWs leads to broadening of the absorption spectra. An array of optimized irregular NWs also has preferable features compared to other broadband structures. Using irregular NW arrays, it is possible to improve the absorption enhancement of solar cells without introducing more absorbing material.

Paper Details

Date Published: 2 November 2015
PDF: 6 pages
Opt. Eng. 54(11) 115102 doi: 10.1117/1.OE.54.11.115102
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Mojtaba Shahraki, Shiraz Univ. of Technology (Iran)
Univ. of Zabol (Iran)
Mohammad Reza Salehi, Shiraz Univ. of Technology (Iran)
Ebrahim Abiri, Shiraz Univ. of Technology (Iran)

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