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International Journal of Photoenergy
Volume 2013 (2013), Article ID 738063, 6 pages
http://dx.doi.org/10.1155/2013/738063
Research Article

H2O2 Treatment of Electrochemically Deposited Cu2O Thin Films for Enhancing Optical Absorption

Department of Engineering Physics, Electronics and Mechanics, Nagoya Institute of Technology, Nagoya 466-8555, Japan

Received 12 December 2012; Revised 22 January 2013; Accepted 22 January 2013

Academic Editor: Fahrettin Yakuphanoglu

Copyright © 2013 Ying Song and Masaya Ichimura. 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

Cu2O is considered to be promising as an absorber layer material of solar cells, but its band gap (about 2.1 eV) is larger than the optimum one (about 1.5 eV). CuO has a smaller band gap of about 1.35 eV. Therefore, we attempted to oxidize Cu2O using H2O2 to increase oxygen ratio and decrease band gap. Cu2O thin films were deposited on indium-tin-oxide-coated glass from an aqueous solution containing CuSO4, lactic acid, and KOH by the galvanostatic electrochemical deposition at 40°C with current density of −1 mA/cm2. Then, the as-prepared copper oxide thin film was dipped in H2O2 (30%) at fixed temperature to oxidize for some time. By the H2O2 treatment at room temperature, the oxygen content was increased, and the band gap was decreased.