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

Author(s): Deng Minghui | Zhang Quanxin | Huang Shuqing | Li Dongmei | Luo Yanhong | Shen Qing | Toyoda Taro | Meng Qingbo

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 5;
Issue: 6;
Start page: 986;
Date: 2010;
Original page

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

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.

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