Enhancement of charge photo-generation and transport viaan internal network of Sb sub(2)Se sub(3)/Cu sub(2 )GeSe sub(3) heterojunctions

An interpenetrating iodine-doped-Sb sub(2)Se sub(3)/C u sub(2)GeSe sub(3) 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 heterojunct...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2014-09, Vol.2 (40), p.17099-17106
Main Authors: Zhang, Xianghua, Xu, Yang, Shen, Qianhong, Fan, Bo, Qiao, Xusheng, Fan, Xianping, Yang, Hui, Luo, Qun, Calvez, Laurent, Ma, Hongli, Cathelinaud, Michel, Simon, Jean-Jacques
Format: Article
Language:English
Subjects:
Channels
Charge
Crystals
Heterojunctions
Illumination
Photocurrent
Photoelectric effect
Sustainability
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Summary:An interpenetrating iodine-doped-Sb sub(2)Se sub(3)/C u sub(2)GeSe sub(3) 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 Cu sub(2)GeSe sub(3) nanoparticles aggregated between the Sb sub(2)Se sub(3) rods. The photo-electrochemical measurement shows that this structure results in a photocurrent of 74 mu A cm super(-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 super(-2). This photocurrent is at least 100 times higher than any of these two crystals individually.
ISSN:2050-7488
2050-7496
DOI:10.1039/c4ta03491k