文献类型：期刊文献

英文题名：CuInSe2 and CuInSe2-ZnS based high efficiency "green" quantum dot sensitized solar cells

作者：Li, Wenjie[1];Pan, Zhenxiao[1];Zhong, Xinhua[1]

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

年份：2015

卷号：3

期号：4

起止页码：1649

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20150100395419);WOS:【SCI-EXPANDED(收录号:WOS:000346906100037)】；

基金：We acknowledge the National Natural Science Foundation of China (no. 21175043), the Science and Technology Commission of Shanghai Municipality (11JC1403100, 12ZR1407700), and the Fundamental Research Funds for the Central Universities for financial supports.

语种：英文

外文关键词：Copper compounds - Efficiency - Semiconductor quantum dots - Infrared devices - II-VI semiconductors - Nanocrystals - Chalcogenides - Titanium dioxide - Cadmium - Solar cells - Synthesis (chemical) - Chemical stability - Nanostructured materials - Semiconductor alloys

摘要：CuInSe2 (CISe) based quantum dots (QDs), are perceived to be promising alternatives to those of cadmium or lead chalcogenide based QDs in serving as light-harvesting sensitizer materials in quantum dot sensitized solar cells (QDSCs) due to their near-infrared (NIR) absorbing capacity and low toxicity. Herein, we have synthesized high quality CISe QDs via the organic phase high temperature route, and then alloying with ZnS to form the CISeZnS QDs with higher chemical stability and superior optoelectronic properties. The obtained green CISe and CISeZnS QD sensitizers were immobilized onto TiO2 film electrodes with high loading amount through the linker molecule assisted post synthesis assembly approach with the use of MPA-capped water-soluble QDs. Hindered charge recombination in the built CISeZnS QD based solar cells in comparison with reference CISe cells has been confirmed by impedance spectroscopy, as well as transient photovoltage decay measurements. With the combination of high QD loading and passivated trap-state defects, the resulting regenerative sandwich CISeZnS QD based champion solar cells exhibited an efficiency of 6.79% (J(sc) = 22.61 mA cm(-2), V-oc = 0.583 V, FF = 0.515) under AM 1.5 G full one sun irradiation. The obtained efficiency was among the best performances for liquid-junction QDSCs and also demonstrated comparable photovoltaic performance of green CISe based QDs to the toxic cadmium and lead chalcogenide QDs.