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Journal of Nanomaterials
Volume 2013, Article ID 785359, 6 pages
http://dx.doi.org/10.1155/2013/785359
Research Article

Influences of InGaP Conical Frustum Nanostructures on the Characteristics of GaAs Solar Cells

Department of Electrical and Computer Engineering, Ajou University, Suwon 443-749, Republic of Korea

Received 12 April 2013; Revised 8 July 2013; Accepted 22 July 2013

Academic Editor: Sudhakar Nori

Copyright © 2013 Nguyen Dinh Lam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Conical frustums with quasihexagonal nanostructures are fabricated on an InGaP window layer of single junction GaAs solar cells using a polystyrene nanosphere lithography technique followed by anisotropic etching processes. The optical and photovoltaic characteristics of the conical frustum nanostructured solar cells are investigated. Reflectance of the conical frustum nanostructured solar cells is significantly reduced in a wide range of wavelengths compared to that of the planar sample. The measured reflectance reduction is attributed to the gradual change in the refractive index of the InGaP conical frustum window layer. An increase of 15.2% in the power conversion efficiency has been achieved in the fabricated cell with an optimized conical frustum nanostructure compared to that of the planar cell.