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CuInS2 quantum dot-sensitized TiO2 nanorod array photoelectrodes: synthesis and performance optimization

Zhengji Zhou, Shengjie Yuan, Junqi Fan, Zeliang Hou, Wenhui Zhou, Zuliang Du and Sixin Wu*

Author Affiliations

Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004, China

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Nanoscale Research Letters 2012, 7:652  doi:10.1186/1556-276X-7-652

Published: 27 November 2012


CuInS2 quantum dots (QDs) were deposited onto TiO2 nanorod arrays for different cycles by using successive ionic layer adsorption and reaction (SILAR) method. The effect of SILAR cycles on the light absorption and photoelectrochemical properties of the sensitized photoelectrodes was studied. With optimization of CuInS2 SILAR cycles and introduction of In2S3 buffer layer, quantum dot-sensitized solar cells assembled with 3-μm thick TiO2 nanorod film exhibited a short-circuit current density (Isc) of 4.51 mA cm−2, an open-circuit voltage (Voc) of 0.56 V, a fill factor (FF) of 0.41, and a power conversion efficiency (η) of 1.06%, respectively. This study indicates that SILAR process is a very promising strategy for preparing directly anchored semiconductor QDs on TiO2 nanorod surface in a straightforward but controllable way without any complicated fabrication procedures and introduction of a linker molecule.

CuInS2; Quantum dots; TiO2; Nanorod arrays; Photoelectrochemical properties