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High Optical Absorption of Indium Sulfide Nanorod Arrays Formed by Glancing Angle Deposition

Published online by Cambridge University Press:  31 January 2011

Mehmet Cansizoglu ,
Robert Engelken ,
Hye-Won Seo  and
Tansel Karabacak
Mehmet Cansizoglu
Affiliation:
mfcansizoglu@ualr.edufatihcans@gmail.com, University of Arkansas at Little Rock, Applied Science, Little Rock, Arkansas, United States
Robert Engelken
Affiliation:
BDENGENS@astate.edu, Arkansas State University, Electrical Engineering Program, Jonesboro, Arkansas, United States
Hye-Won Seo
Affiliation:
hwseo@ualr.edu, University of Arkansas at Little Rock, Department of Physics and Astronomy, Little Rock, Arkansas, United States
Tansel Karabacak
Affiliation:
txkarabacak@ualr.edu, University of Arkansas at Little Rock, Applied Science, Little Rock, Arkansas, United States
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Abstract

Indium (III) sulfide has recently attracted much attention due to its potential in optical sensors as a photoconducting material and in photovoltaic applications as a wide direct bandgap material. On the other hand, optical absorption properties are key parameters in developing highly photosensitive photodetectors and high efficiency solar cells. We show that indium sulfide nanorod arrays produced by glancing angle deposition techniques have superior absorption and low reflectance properties compared to conventional flat thin film counterparts. We observed an optical absorption value of approximately 96% for nanorods, in contrast to 80% for conventional amorphous-to-polycrystalline thin films of indium sulfide. A photoconductivity response was also observed in the nanorod samples, whereas no measurable photoresponse was detected in conventional thin films. We give a preliminary description of the enhanced light absorption properties of the nanorods by using Shirley-George Model that predicts enhanced diffuse scattering and reduced reflection of light due the rough morphology.

Keywords

absorptionphotoconductivityphotovoltaic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1165: Symposium M – Thin-Film Compound Semiconductor Photovoltaics–2009 , 2009 , 1165-M08-27
Copyright
Copyright © Materials Research Society 2009

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