文献类型：期刊文献

英文题名：Mn doped quantum dot sensitized solar cells with power conversion efficiency exceeding 9%

作者：Wang, Jin[1];Li, Yan[1];Shen, Qing[2,3];Izuishi, Takuya[2];Pan, Zhenxiao[1];Zhao, Ke[1];Zhong, Xinhua[1]

机构：[1]E China Univ Sci & Technol, Inst Appl Chem, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Univ Electrocommun, Dept Engn Sci, Chofu, Tokyo 1828585, Japan;[3]Japan Sci & Technol Agcy JST, Kawaguchi, Saitama 3320012, Japan

年份：2016

卷号：4

期号：3

起止页码：877

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20160201784524);WOS:【SCI-EXPANDED(收录号:WOS:000367625000020)】；

基金：This research is supported by the Natural Science Foundation of China (nos 21421004, 91433106), the Open Project of State Key Laboratory of Chemical Engineering (SKL-ChE-14C04), and the Fundamental Research Funds for the Central Universities in China.

语种：英文

外文关键词：Conversion efficiency - Electrodes - Nanocrystals - Polyelectrolytes - Tellurium compounds - Metal ions - Solar cells - II-VI semiconductors - Electronic properties - Open circuit voltage - Selenium compounds - Manganese - Semiconductor doping - Zinc sulfide - Cadmium compounds - Semiconductor quantum dots - Copper compounds

摘要：Transition metal ion (especially Mn2+) doping has been proven to be an effective approach to modify the intrinsic photo-electronic properties of semiconductor quantum dots (QDs). However, previous works to directly grow Mn doped QDs on TiO2 film electrodes at room temperature resulted in the potential of the Mn dopant not being fully demonstrated in quantum dot sensitized solar cells (QDSCs). Herein, Mn doped CdSe0.65Te0.35 QDs (simplified as Mn : QD) were pre-synthesized via a "growth doping" strategy at high temperature. A QD-sensitized photoanode with the configuration TiO2/Mn : QD/Mn : ZnS/SiO2 was prepared and corresponding cell devices were constructed using Cu2S/brass counter electrodes and polysulfide electrolyte, together with reference cells with the photoanode configurations TiO2/Mn : QD/ZnS/SiO2, TiO2/QD/Mn : ZnS/SiO2, and TiO2/QD/ZnS/SiO2. The photovoltaic performance results indicate that TiO2/Mn : QD/Mn : ZnS/SiO2 cells exhibit the best photovoltaic performance among all the studied cell devices with a power conversion efficiency (PCE) for the champion cell of 9.40% (J(sc) = 20.87 mA cm(-2), V-oc = 0.688 V, FF = 0.655) under AM 1.5 G one full sun illumination, which is among the best results for QDSCs. The open circuit voltage decay (OCVD), impedance spectroscopy (IS) and transient absorption (TA) measurements confirm that the Mn2+ dopant can suppress charge recombination and improve the photovoltage and PCE of the resulting cells.