Core/Shell Colloidal Quantum Dot Exciplex States for the Development of Highly Efficient Quantum-Dot-Sensitized Solar Cells

被引:394
作者
Wang, Jin [1 ]
Mora-Sero, Ivan [2 ]
Pan, Zhenxiao [1 ]
Zhao, Ke [1 ]
Zhang, Hua [1 ]
Feng, Yaoyu [1 ]
Yang, Guang [3 ,4 ]
Zhong, Xinhua [1 ]
Bisquert, Juan [2 ]
机构
[1] E China Univ Sci & Technol, Inst Appl Chem, Key Lab Adv Mat, Shanghai 200237, Peoples R China
[2] Univ Jaume 1, Dept Fis, Photovolta & Optoelect Devices Grp, Castellon de La Plana 12071, Spain
[3] Xi An Jiao Tong Univ, Key Lab, Elect Mat Res Lab, Minist Educ, Xian 710049, Peoples R China
[4] Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Peoples R China
基金
中国国家自然科学基金;
关键词
PHOTOINDUCED ELECTRON-TRANSFER; CDSE NANOCRYSTALS; SEMICONDUCTOR NANOCRYSTALS; CHARGE SEPARATION; TIO2; SIZE; DYE; ADSORPTION; PERFORMANCE; TRANSPORT;
D O I
10.1021/ja4079804
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Searching suitable panchromatic QD sensitizers for expanding the light-harvesting range, accelerating charge separation, and retarding charge recombination is an effective way to improve power conversion efficiency (PCE) of quantum-dot-sensitized solar cells (QDSCs). One possible way to obtain a wide absorption range is to use the exciplex state of a type-II core/shell-structured QDs. In addition, this system could also provide a fast charge separation and low charge-recombination rate. Herein, we report on using a CdTe/CdSe type-II core/shell QD sensitizer with an absorption range extending into the infrared region because of its exciplex state, which is covalently linked to TiO2 mesoporous electrodes by dropping a bifunctional linker molecule mercaptopropionic acid (MPA)-capped QD aqueous solution onto the film electrode. High loading and a uniform distribution of QD sensitizer throughout the film electrode thickness have been confirmed by energy dispersive X-ray (EDX) elemental mapping. The accelerated electron injection and retarded charge-recombination pathway in the built CdTe/CdSe QD cells in comparison with reference CdSe QD-based cells have been confirmed by impedance spectroscopy, fluorescence decay, and intensity-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) analysis. With the combination of the high QD loading and intrinsically superior optoelectronic properties of type-II core/shell QD (wide absorption range, fast charge separation, and slow charge recombination), the resulting CdTe/CdSe QD-based regenerative sandwich solar cells exhibit a record PCE of 6.76% (J(sc) = 19.59 mA cm(-2), V-oc = 0.606 V, and FF = 0.569) with a mask around the active film under a full 1 sun illumination (simulated AM 1.5), which is the highest reported to date for liquid-junction QDSCs.
引用
收藏
页码:15913 / 15922
页数:10
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