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Proceedings Paper

Light management on industrial size c-Si solar cells by Si nanowires fabricated by metal-assisted etching
Author(s): Firat Es; Olgu Demircioglu; Mustafa Kulakci; Husnu Emrah Unalan; Rasit Turan
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Paper Abstract

Absorption of the light by a solar cell can be improved significantly by light trapping structures formed on the front surface of the device. In particular, thin crystalline and amorphous solar cells are expected to benefit from the improved light absorption in a region closer to the surface of the cell. Recently, we have shown that vertically aligned silicon (Si) nanowires formed on flat (100) Si wafer surface by metal assisted etching can effectively be used for this purpose. In this paper we present demonstration of nanowire application to industrial size solar cell system and a comparison between flat and pyramid textured Si wafers. Standard procedures were followed to fabricate solar cells with and without Si nanowire process on mirror like and pyramid textured Si wafers. The dependence of the solar cell parameters on the process parameters was studied systematically. Reflection spectra showed successful light trapping behavior on the surface of the cells. In all samples, we have obtained excellent current-voltage (I-V) characteristics with high fill factors. However, the efficiency of the cells was found to decrease with the etch duration. This can be attributed to the increased recombination along the nanowires or increased surface area due to the roughening of the surface after etching process.

Paper Details

Date Published: 3 May 2012
PDF: 5 pages
Proc. SPIE 8373, Micro- and Nanotechnology Sensors, Systems, and Applications IV, 837312 (3 May 2012); doi: 10.1117/12.918884
Show Author Affiliations
Firat Es, Middle East Technical Univ. (Turkey)
Olgu Demircioglu, Middle East Technical Univ. (Turkey)
Mustafa Kulakci, Middle East Technical Univ. (Turkey)
Husnu Emrah Unalan, Middle East Technical Univ. (Turkey)
Rasit Turan, Middle East Technical Univ. (Turkey)

Published in SPIE Proceedings Vol. 8373:
Micro- and Nanotechnology Sensors, Systems, and Applications IV
Thomas George; M. Saif Islam; Achyut Dutta, Editor(s)

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