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Open Access Nano Express

Low-Cost Flexible Nano-Sulfide/Carbon Composite Counter Electrode for Quantum-Dot-Sensitized Solar Cell

Minghui Deng1, Quanxin Zhang1, Shuqing Huang1, Dongmei Li1, Yanhong Luo1, Qing Shen23, Taro Toyoda2 and Qingbo Meng1*

Author affiliations

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China

2 Department of Applied Physics and Chemistry, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585, Japan

3 PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama, 332-0012, Japan

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Citation and License

Nanoscale Research Letters 2010, 5:986-990  doi:10.1007/s11671-010-9592-3

Published: 14 April 2010

Abstract

Cu2S nanocrystal particles were in situ deposited on graphite paper to prepare nano-sulfide/carbon composite counter electrode for CdS/CdSe quantum-dot-sensitized solar cell (QDSC). By optimization of deposition time, photovoltaic conversion efficiency up to 3.08% was obtained. In the meantime, this composite counter electrode was superior to the commonly used Pt, Au and carbon counter electrodes. Electrochemical impedance spectra further confirmed that low charge transfer resistance at counter electrode/electrolyte interface was responsible for this, implied the potential application of this composite counter electrode in high-efficiency QDSC.

Keywords:
Quantum dot; Sensitized solar cell; Composite; Flexible; Carbon electrode; Cu2S; CdS/CdSe