Enhancement of charge photo-generation and transport via an internal network of Sb2Se3/Cu2GeSe3 heterojunctions

Xianghua Zhang; Yang Xu; Qianhong Shen; Bo Fan; Xusheng Qiao; Xianping Fan; Hui Yang; Qun Luo; Laurent Calvez; Hongli Ma; Michel Cathelinaud; Jean-Jacques Simon

doi:10.1039/C4TA03491K

Enhancement of charge photo-generation and transport via an internal network of Sb₂Se₃/Cu₂GeSe₃ heterojunctions†

Xianghua Zhang,^a Yang Xu,^a Qianhong Shen,^b Bo Fan,*^ac Xusheng Qiao,^b Xianping Fan,*^b Hui Yang,^b Qun Luo,^b Laurent Calvez,^a Hongli Ma,^a Michel Cathelinaud^a and Jean-Jacques Simon^d

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* Corresponding authors

^a Laboratory of Glasses and Ceramics, Institute of Chemical Science UMR CNRS 6226, University of Rennes 1, 35042 Rennes, France
E-mail: fanb07@hotmail.com

^b Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, P.R. China
E-mail: fanxp@zju.edu.cn

^c College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518052, P.R. China

^d Aix Marseille Université, IM2NP UMR CNRS 7334, 13397 Marseille Cedex 20, France

Abstract

An interpenetrating iodine-doped-Sb₂Se₃/Cu₂GeSe₃ heterojunction network has been fabricated by controlling the crystallization of a chalcogenide glass. These two crystals absorb strongly and widely the solar spectrum for efficient charge photo-generation, and the heterojunction formed by these two crystals greatly promotes the charge separation. More importantly, these free charge carriers can be efficiently transported through the conductive channels formed by the oriented Cu₂GeSe₃ nanoparticles aggregated between the Sb₂Se₃ rods. The photo-electrochemical measurement shows that this structure results in a photocurrent of 74 μA cm⁻² and a photo-current/dark-current ratio over 12 times at a bias voltage of −0.6 V and under an illumination of 250 W cm⁻². This photocurrent is at least 100 times higher than any of these two crystals individually.

Journal of Materials Chemistry A

Enhancement of charge photo-generation and transport via an internal network of Sb₂Se₃/Cu₂GeSe₃ heterojunctions†

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Enhancement of charge photo-generation and transport via an internal network of Sb₂Se₃/Cu₂GeSe₃ heterojunctions

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Journal of Materials Chemistry A