Strong broadband optical absorption in silicon nanowire films
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- 1 January 2007
- journal article
- Published by SPIE-Intl Soc Optical Eng in Journal of Nanophotonics
- Vol. 1 (1) , 013552-013552-10
- https://doi.org/10.1117/1.2768999
Abstract
The broadband optical absorption properties of silicon nanowire (SiNW) films fabricated on glass substrates by wet etching and chemical vapor deposition (CVD) have been measured and found to be higher than solid thin films of equivalent thickness. The observed behavior is adequately explained by light scattering and light trapping though some of the observed absorption is due to a high density of surface states in the nanowires films, as evidenced by the partial reduction in high residual sub-bandgap absorption after hydrogen passivation. Finite difference time domain simulations show strong resonance within and between the nanowires in a vertically oriented array and describe the experimental absorption data well. These structures may be of interest in optical films and optoelectronic device applications.Keywords
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