Understanding the interfacial charge transfer process and its dynamical mechanism is crucial to design efficient photoelectric devices. Methylammonium lead halide perovskite and zinc oxide (ZnO) have been demonstrated as promising candidates for excellent solar cells and photodetectors. However, the carrier transport process has not yet been fully explored on the perovskite surface and the perovskite/ZnO interface. Herein, a CH3NH3PbBr3-ZnO heterojunction was constructed as a quasi-phototransistor, where an apparent negative photoconductance was observed under illumination. Based on electrical and optical characterization, the photogenerated carrier transfer dynamics at CH3NH3PbBr3, ZnO, and their interface were investigated in detail. It can be assigned that the photogenerated electrons transfer toward the CH3NH3PbBr3 surface and the holes transfer to interior, so that the light-induced built-in electric field change would serve as the photogate to control the current flowing in the CH3NH3PbBr3-ZnO channel. These results provide clear images on the charge diffusion and drift process in the CH3NH3PbBr3-ZnO heterostructure. The study on the dynamics of negative photoconductivity of CH3NH3PbBr3-ZnO has great value for understanding the carrier transport properties and constructing perovskite heterostructure memory and optical switching devices.
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26 April 2021
Research Article|
April 26 2021
Dynamics of interfacial carriers and negative photoconductance in CH3NH3PbBr3-ZnO heterostructure
Feng Chen;
Feng Chen
1
State Key Laboratory of Bioelectronics, School of Physics, the National Demonstration Center for Experimental Biomedical Engineering Education (Southeast University), Southeast University
, Nanjing 210096, People's Republic of China
2
School of Physical and Mathematical Sciences, Nanjing Tech University
, Nanjing 211816, People's Republic of China
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Zengliang Shi;
Zengliang Shi
1
State Key Laboratory of Bioelectronics, School of Physics, the National Demonstration Center for Experimental Biomedical Engineering Education (Southeast University), Southeast University
, Nanjing 210096, People's Republic of China
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Jinping Chen;
Jinping Chen
1
State Key Laboratory of Bioelectronics, School of Physics, the National Demonstration Center for Experimental Biomedical Engineering Education (Southeast University), Southeast University
, Nanjing 210096, People's Republic of China
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Qiannan Cui;
Qiannan Cui
1
State Key Laboratory of Bioelectronics, School of Physics, the National Demonstration Center for Experimental Biomedical Engineering Education (Southeast University), Southeast University
, Nanjing 210096, People's Republic of China
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Aoqun Jian;
Aoqun Jian
3
MicroNano System Research Center, College of Information Engineering and Computer Science, Taiyuan University of Technology, Key Laboratory of Advanced Transducers and Intelligent Control System, Shanxi Province and Ministry of Education
, Taiyuan 030024, People's Republic of China
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Yizhi Zhu;
Yizhi Zhu
1
State Key Laboratory of Bioelectronics, School of Physics, the National Demonstration Center for Experimental Biomedical Engineering Education (Southeast University), Southeast University
, Nanjing 210096, People's Republic of China
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Qingyu Xu
;
Qingyu Xu
a)
1
State Key Laboratory of Bioelectronics, School of Physics, the National Demonstration Center for Experimental Biomedical Engineering Education (Southeast University), Southeast University
, Nanjing 210096, People's Republic of China
a)Authors to whom correspondence should be addressed: xuqingyu@seu.edu.cn; zhdlou@bjtu.edu.cn; and xcxseu@seu.edu.cn
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Zhidong Lou;
Zhidong Lou
a)
4
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University
, Beijing 100044, People's Republic of China
a)Authors to whom correspondence should be addressed: xuqingyu@seu.edu.cn; zhdlou@bjtu.edu.cn; and xcxseu@seu.edu.cn
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Chunxiang Xu
Chunxiang Xu
a)
1
State Key Laboratory of Bioelectronics, School of Physics, the National Demonstration Center for Experimental Biomedical Engineering Education (Southeast University), Southeast University
, Nanjing 210096, People's Republic of China
a)Authors to whom correspondence should be addressed: xuqingyu@seu.edu.cn; zhdlou@bjtu.edu.cn; and xcxseu@seu.edu.cn
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a)Authors to whom correspondence should be addressed: xuqingyu@seu.edu.cn; zhdlou@bjtu.edu.cn; and xcxseu@seu.edu.cn
Appl. Phys. Lett. 118, 171901 (2021)
Article history
Received:
February 10 2021
Accepted:
April 09 2021
Citation
Feng Chen, Zengliang Shi, Jinping Chen, Qiannan Cui, Aoqun Jian, Yizhi Zhu, Qingyu Xu, Zhidong Lou, Chunxiang Xu; Dynamics of interfacial carriers and negative photoconductance in CH3NH3PbBr3-ZnO heterostructure. Appl. Phys. Lett. 26 April 2021; 118 (17): 171901. https://doi.org/10.1063/5.0047122
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