Nitrogen-Doped Mesoporous Carbons as Counter Electrodes in Quantum Dot Sensitized Solar Cells with a Conversion Efficiency Exceeding 12%

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• 作者：Shuang Jiao ; Jun Du ; Zhonglin Du ; Donghui LongWuyou Jiang ; Zhenxiao Pan ; Yan Li ; Xinhua Zhong
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2017
• 出版时间：February 2, 2017
• 年：2017
• 卷：8
• 期：3
• 页码：559-564
• 全文大小：465K
• ISSN：1948-7185

文摘

The exploration of catalyst materials for counter electrodes (CEs) in quantum dot sensitized solar cells (QDSCs) that have both high electrocatalytic activity and low charge transfer resistance is always significant yet challenging. In this work, we report the incorporation of nitrogen heteroatoms into carbon lattices leading to nitrogen-doped mesoporous carbon (N-MC) materials with superior catalytic activity when used as CEs in Zn–Cu–In–Se QDSCs. A series of N-MC materials with different nitrogen contents were synthesized by a colloidal silica nanocasting method. Electrochemical measurements revealed that the N-MC with a nitrogen content of 8.58 wt % exhibited the strongest activity in catalyzing the reduction of a polysulfide redox couple (S_n^2–/S^2–), and therefore, the corresponding QDSC device showed the best photovoltaic performance with an average power conversion efficiency (PCE) of 12.23% and a certified PCE of 12.07% under one full sun illumination, which is a new PCE record for quantum dot based solar cells.