Optical Design and Engineering

Optimal design of laterally assembled hexagonal silicon nanowires for broadband absorption enhancement in ultrathin solar cells

[+] Author Affiliations
Mojtaba Shahraki

Shiraz University of Technology, Faculty of Electrical and Electronics Engineering, P.O. Box 71555-313, Shiraz 7155713876, Iran

University of Zabol, Faculty of Electrical and Electronics Engineering, P.O. Box 98615-538, Zabol 9861335856, Iran

Mohammad Reza Salehi, Ebrahim Abiri

Shiraz University of Technology, Faculty of Electrical and Electronics Engineering, P.O. Box 71555-313, Shiraz 7155713876, Iran

Opt. Eng. 54(11), 115102 (Nov 02, 2015). doi:10.1117/1.OE.54.11.115102
History: Received September 1, 2015; Accepted October 8, 2015
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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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Mojtaba Shahraki ; Mohammad Reza Salehi and Ebrahim Abiri
"Optimal design of laterally assembled hexagonal silicon nanowires for broadband absorption enhancement in ultrathin solar cells", Opt. Eng. 54(11), 115102 (Nov 02, 2015). ; http://dx.doi.org/10.1117/1.OE.54.11.115102


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