Surface photovoltage phase spectra for analysing the photoinduced charge transfer kinetics of novel BiOBr/Bi2S3 heterojunction films

Huimin JIA, Weiwei HE, Yong XIANG, Zhi ZHENG*

*Corresponding author for this work

Research output: Book Chapters | Papers in Conference ProceedingsConference paper (refereed)Researchpeer-review

2 Citations (Scopus)

Abstract

The rational design of high performance hetero-structure photovoltaic devices requires full understanding of the photoinduced charge transfer mechanism and kinetics at the interface of heterojunctions. In this paper, p-BiOBr/n-Bi2S3 heterojunction have been designed and in-situ fabricated by a facile ion exchange method between BiOBr and thioacetamide (TAA). The degree of transformation of BiOBr to Bi2S3 was controlled through the adjustment of exposure time of BiOBr/FTO substrate to thioacetamide (TAA) aqueous solution. The morphologies of BiOBr and BiOBr/Bi2S3 heterojunctions films were examined by X-ray diffraction (XRD), scanning electron microscope (SEM) and high resolution transmission electron microscopy (HRTEM). The presence of Bi2S3 was further validated through energy dispersive X-ray spectroscopy (EDS). Assisted by the surface photovoltage (SPV) and transient photovoltage (TPV) technique, the photoinduced charge transfer kinetics on BiOBr nanosheet and BiOBr/Bi2S3 interface were systematically investigated. It was found that the BiOBr/Bi2S3 nanosheet array heterojunctions were more efficient in facilitating the separation of photoinduced charge carriers than pure BiOBr film, which attributable to the stronger photo absorption and better photogenerated charge carrier separation and transport efficiency. This solution-based process directly on FTO offers the promise for low-cost, large-area application of the manufacturing of the third generation thin-film photovoltaic devices.

Original languageEnglish
Title of host publication2016 International Conference on Materials Science, Resource and Environmental Engineering, MSREE 2016
EditorsJianfeng KE, Zhihui TAN, Zhibin YOU
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735414600
DOIs
Publication statusPublished - 6 Jan 2017
Externally publishedYes
Event2016 International Conference on Materials Science, Resource and Environmental Engineering, MSREE 2016 - Xi'an City, Shaanxi Province, China
Duration: 10 Dec 201611 Dec 2016

Publication series

NameAIP Conference Proceedings
Volume1794
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2016 International Conference on Materials Science, Resource and Environmental Engineering, MSREE 2016
Country/TerritoryChina
CityXi'an City, Shaanxi Province
Period10/12/1611/12/16

Bibliographical note

This work was financially supported by the National Natural Science Foundation of China (Grant No.61204009 and 21273192), Science and Technology Innovation Talents in University of Henan Province (14HASTIT008), Innovation Scientists and Technicians Troop Construction Projects of Henan Province (Grant No. 144200510014).

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