High-Performance Self-Powered Ultraviolet Photodetector based on Coupled Ferroelectric Depolarization Field and Heterojunction Built-In Potential

被引：63
作者：
Chen, Jian [1 ]
Wang, Zihui [1 ]
He, Huanfeng [1 ]
Mao, Jiaxing [1 ]
Zhang, Ying [1 ]
Zhang, Qingfeng [1 ]
Li, Mingkai [1 ]
Lu, Yinmei [1 ]
He, Yunbin [1 ]
机构：
[1] Hubei Univ, Sch Mat Sci & Engn,Minist Educ, Hubei Key Lab Polymer Mat,Key Lab Green Preparat, Hubei Key Lab Ferro & Piezoelect Mat & Devices, Wuhan 430062, Peoples R China
来源：
ADVANCED ELECTRONIC MATERIALS | 2021年 / 7卷 / 12期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
ferroelectrics; heterojunction; PLZT; self-powered photodetectors; ZnO; BATIO3; MATERIALS; ENHANCED PHOTOCURRENT; THIN-FILM; TEMPERATURE; PEROVSKITE; ORIGIN;
D O I：
10.1002/aelm.202100717
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ferroelectric materials have aroused increasing interest in the field of self-powered ultraviolet (UV) photodetectors for their polarization electric field induced photovoltaic (PV) effect. However, the device performance of currently reported ferroelectric-based self-powered UV detectors remains to be improved. Herein, achievement of high-performance ZnO/Pb0.95La0.05Zr0.54Ti0.46O3 (PLZT) heterojunction-based self-powered UV photodetectors is demonstrated by coupling the ferroelectric depolarization electric field (E-dp) and built-in electric field (E-ZnO/PLZT) at the ZnO/PLZT interface with a II-type energy band alignment. The ZnO/PLZT heterojunction-based self-powered UV photodetector shows a remarkable responsivity (R = 3.96 mA W-1) and detectivity (D* = 6.6 x 10(10) Jones), which are by two orders of magnitude larger than those of the device that are produced under similar conditions without ZnO layer. Moreover, the ZnO/PLZT heterojunction-based device exhibits a rapid response (rise time tau(r) = 0.04 s, decay time tau(d) = 0.05 s), which is faster than most of previous reports. The excellent device performance of the ZnO/PLZT heterojunction-based device can be attributed to the efficient separation and transport of photogenerated carriers caused by the constructive coupling of E-dp and E-ZnO/PLZT. This work offers a feasible and effective strategy for the performance improvement of ferroelectric-based self-powered UV detectors.
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页数：7
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