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Morphology dependent optical properties of ZnO/SiNWs nanocomposites

Published online by Cambridge University Press:  16 May 2017

Aliaksandr Sharstniou ,
Stanislau Niauzorau ,
Eugene Chubenko ,
Bruno P. Azeredo  and
Vitaly Bondarenko
Aliaksandr Sharstniou
Affiliation:
Belarusian State University of Informatics and Radioelectronics, 6 P. Brovki str., Minsk, Belarus.
Stanislau Niauzorau
Affiliation:
Belarusian State University of Informatics and Radioelectronics, 6 P. Brovki str., Minsk, Belarus.
Eugene Chubenko
Affiliation:
Belarusian State University of Informatics and Radioelectronics, 6 P. Brovki str., Minsk, Belarus.
Bruno P. Azeredo
Affiliation:
Arizona State University, The Polytechnic School, Mesa, AZ, USA.
Vitaly Bondarenko*
Affiliation:
Belarusian State University of Informatics and Radioelectronics, 6 P. Brovki str., Minsk, Belarus.
*
*(Email: vitaly51@mail.ru)
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Abstract

Zinc oxide/silicon nanowires (ZnO/SiNWs) nanocomposites is a promising material for heterojunction solar cells. They combine the low-reflectivity of SiNWs, where photogenerated charge carriers are produced and harvested, and the high transparency of ZnO, which serves as a functional transparent conductive electrode. In this paper, we present a study of the anti-reflective properties of ZnO/SiNWs core-shell nanostructures. SiNWs were fabricated by a two-step metal-assisted chemical etching and coated with ZnO by electrochemical deposition. Particularly, the change in the specular reflectance of ZnO/SiNWs nanocomposites as a function of thermal annealing temperature under ambient atmosphere is investigated. First, it was shown that the reflectance in the wavelength range of 400-1000 nm of as-synthesized ZnO/SiNWs nanocomposites increases when compared to the bare SiNWs formed from Si wafers with resistivity of 0.3 and 12 Ω∙cm by an 0.51 % and 0.47 %, respectively. Second, it was found that annealed ZnO/SiNWs had a 0.26 % and 0.17 % lower reflectance in the wavelength range of 400-1000 nm than as-synthesized ZnO/SiNWs and yet higher than bare SiNWs. Potential causes such results are discussed in the context of existing literature.

Keywords

annealingelectrodepositionnanostructure
Type
Articles
Information
MRS Advances , Volume 2 , Issue 58-59: Nanomaterials , 2017 , pp. 3667 - 3672
Copyright
Copyright © Materials Research Society 2017 

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