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Proceedings Paper

Scalable synthesis of vertically aligned, catalyst-free gallium arsenide nanowire arrays: towards optimized optical absorption
Author(s): Maoqing Yao; Anuj R. Madaria; ChunYung Chi; Ningfeng Huang; Chenxi Lin; Michelle L. Povinelli; P. Daniel Dapkus; Chongwu Zhou
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Paper Abstract

Recently nanostructure materials have emerged as a building block for constructing next generation of photovoltaic devices. Nanowire based semiconductor solar cells, among other candidates, have shown potential to produce high efficiency. In a radial pn junction light absorption and carrier collection can be decoupled. Also nanowires can increase choice of materials one can use to fabricate high efficiency tandem solar cells by relaxing the lattice-match constraint. Here we report synthesis of vertical III-V semiconducting nanowire arrays using Selective-Area Metal Organic Chemical Vapor Deposition (SA-MOCVD) technique, which can find application in various optoelectronic devices. We also demonstrate nanosphere lithography (NSL) patterning techniques to obtain ordered pattern for SAMOCVD. Reflection spectrum of nanowires array made by this technique shows excellent light absorption performance without additional anti-reflection coating layer. Thus, we show that highly ordered nanowire structure is 'not needed' to maximize the absorption in vertical nanowire array. Our scalable approach for synthesis of vertical semiconducting nanowire can have application in high throughput and low cost optoelectronic devices including photovoltaic devices.

Paper Details

Date Published: 3 May 2012
PDF: 8 pages
Proc. SPIE 8373, Micro- and Nanotechnology Sensors, Systems, and Applications IV, 837314 (3 May 2012); doi: 10.1117/12.919283
Show Author Affiliations
Maoqing Yao, The Univ. of Southern California (United States)
Anuj R. Madaria, The Univ. of Southern California (United States)
ChunYung Chi, The Univ. of Southern California (United States)
Ningfeng Huang, The Univ. of Southern California (United States)
Chenxi Lin, The Univ. of Southern California (United States)
Michelle L. Povinelli, The Univ. of Southern California (United States)
P. Daniel Dapkus, The Univ. of Southern California (United States)
Chongwu Zhou, The Univ. of Southern California (United States)


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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