PbS as a Highly Catalytic Counter Electrode for Polysulfide-Based Quantum Dot Solar Cells

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• 作者：Zion Tachan ; Menny Shalom ; Idan Hod ; Sven Ru虉hle ; Shay Tirosh ; Arie Zaban
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：April 7, 2011
• 年：2011
• 卷：115
• 期：13
• 页码：6162-6166
• 全文大小：794K
• 年卷期：v.115,no.13(April 7, 2011)
• ISSN：1932-7455

文摘

We show that a significant improvement of the light to electric power conversion efficiency of quantum dot sensitized solar cells with a polysulfide electrolyte can be achieved when a PbS counter electrode is used. An acid pretreatment of a Pb metal foil followed by dipping into polysulfide solution provides a counter electrode which improves the short circuit current, open circuit voltage, and fill factor compared to commonly used Pt electrodes. Electrochemical impedance spectroscopy reveals a low charge transfer resistance between polysulfide and PbS, indicating the high catalytic activity of PbS. Moreover, a comparison with reported charge transfer resistance values at open circuit potential for alternative counter electrodes for polysulfide shows that PbS is the most catalytic of all. For a CdSe quantum dot sensitized mesoporous TiO₂ electrode, we achieved a conversion efficiency of 3% using PbS as a counter electrode.