文献类型：期刊文献

英文题名：Electroplating Cuprous Sulfide Counter Electrode for High-Efficiency Long-Term Stability Quantum Dot Sensitized Solar Cells

作者：Zhao, Ke[1];Yu, Haijing[1];Zhang, Hua[1];Zhong, Xinhua[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Inst Appl Chem, Shanghai 200237, Peoples R China

年份：2014

卷号：118

期号：11

起止页码：5683

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20141317522056);WOS:【SCI-EXPANDED(收录号:WOS:000333381300008)】；

基金：This work has been financially supported by the National Natural Science Foundation of China (No. 21175043), the Science and Technology Commission of Shanghai Municipality (11JC1403100, 12NM0504101, and 12ZR1407700), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Catalyst activity - Quantum efficiency - Electrodes - Nanocrystals - Semiconductor quantum dots - Copper compounds - Selenium compounds - Cadmium compounds - Nanocomposites - Polyelectrolytes - Glass substrates - Solar cells - Tin oxides - Glass - Polysulfides - II-VI semiconductors

摘要：Currently, Cu2S based on brass foil is the most commonly used counter electrode (CE) in high efficiency quantum dot sensitized solar cells (QDSCs) because of its superior catalytic activity to the polysulfide electrolyte redox couple. Regretfully, the brass substrate is limited by the shortcomings of corrosion by polysulfide electrolyte and lack of long-term stability. In order to combine the high catalytic activity of Cu2S and superior tolerance of fluorine doped tin oxide (FTO) glass to polysulfide electrolyte, Cu2S film on the FTO glass substrate (Cu2S/FTO) CE was prepared by electrodeposition of the copper film via a multipotential step technique followed by dipping into polysulfide methanol solution. The Cu2S film was proven to be composed by the interconnected nanoflakes, which ensures the highly catalytic activity to the polysulfide redox couple electrolyte in QDSCs. The CdSe quantum dot (QD) sensitized solar cells with the optimized Cu2S/FTO CE exhibit a power conversion efficiency (PCE) of 5.21%, which is very close to that with the commonly used Cu2S/brass CE (5.41%) and much higher than that of Pt CE (1.68%). Furthermore, the cell device based on the Cu2S/FTO CE shows superior stability at a working state for over 10 h without decrease in PCE, which is a serious challenge for the Cu2S/brass CE.