文献类型：期刊文献

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

作者：Jiao, Shuang[1];Du, Jun[1];Du, Zhonglin[1];Long, Donghui[3];Jiang, Wuyou[3];Pan, Zhenxiao[1];Li, Yan[1];Zhong, Xinhua[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]South China Agr Univ, Coll Mat & Energy, 483 Wushan Rd, Guangzhou 510642, Guangdong, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：8

期号：3

起止页码：559

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY LETTERS

收录：;EI(收录号：20170603327595);WOS:【SCI-EXPANDED(收录号:WOS:000393443400003)】；

基金：This research is supported by the Natural Science Foundation of China (no. 91433106, 21573249), the Program of Introducing Talents of Discipline to Universities (B16017), and the Fundamental Research Funds for the Central Universities in China.

语种：英文

外文关键词：Conversion efficiency - Nanocrystals - Electrodes - Semiconductor quantum dots - Carbon - Charge transfer - Doping (additives) - Mesoporous materials - Copper compounds - Solar power generation - Silica - Catalyst activity - Nitrogen - Selenium compounds - Zinc compounds

摘要：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-)/S2-), 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.