title: Mechanistic insights into the photoinduced charge carrier dynamics of BiOBr/CdS nanosheet heterojunctions for photovoltaic application.
abstract: The rational design of high performance hetero-structure photovoltaic devices requires a full understanding of the photoinduced charge transfer mechanism and kinetics at the interface of heterojunctions. In this paper, we intelligently fabricated p-BiOBr/n-CdS heterojunctions with perfect nanosheet arrays by using a facile successive ionic layer adsorption and reaction and chemical bath deposition methods at low temperature. A BiOBr/CdS heterojunction based solar cell has been fabricated which exhibited enhanced photovoltaic responses. Assisted by the surface photovoltage (SPV), transient photovoltage (TPV) and Kelvin probe technique, the photoinduced charge transfer dynamics on the BiOBr nanosheet and p-BiOBr/n-CdS interface were systematically investigated. It was found that the BiOBr/CdS nanosheet array heterojunctions were more efficient in facilitating charge carrier separation than both bare BiOBr and CdS films. The mechanism underlying the photoinduced charge carrier transfer behaviour was unravelled by allying the energy band of BiOBr/CdS p-n junctions from both the interfacial electric field and surface electric field. In addition, the CdS loading thickness in the p-BiOBr/n-CdS heterojunction and the incident wavelength affected greatly the transfer behavior of photoinduced charges, which was of great value for design of photovoltaic devices.
authors.affiliation: School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China. xiang@uestc.edu.cn and Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, College of Advanced Materials and Energy, Institute of Surface Micro and Nano Materials, Xuchang University, Henan 461000, P. R. China. zzheng@xcu.edu.cn.
authors.forename: Huimin
authors.initials: H
authors.lastname: Jia
authors.affiliation: Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, College of Advanced Materials and Energy, Institute of Surface Micro and Nano Materials, Xuchang University, Henan 461000, P. R. China. zzheng@xcu.edu.cn.
authors.forename: Beibei
authors.initials: B
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, College of Advanced Materials and Energy, Institute of Surface Micro and Nano Materials, Xuchang University, Henan 461000, P. R. China. zzheng@xcu.edu.cn.
authors.forename: Weiwei
authors.initials: W
authors.lastname: He
authors.affiliation: School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China. xiang@uestc.edu.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Xiang
authors.affiliation: Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, College of Advanced Materials and Energy, Institute of Surface Micro and Nano Materials, Xuchang University, Henan 461000, P. R. China. zzheng@xcu.edu.cn.
authors.forename: Zhi
authors.identifier: http://orcid.org/0000-0002-3495-9514
authors.initials: Z
authors.lastname: Zheng