Highly sensitive ultraviolet photodetectors based on ZnO/SnO2 core-shell nanorod arrays

被引：51
|
作者：
Fu, Qiu-Ming [1 ]
Peng, Ji-Liang [1 ]
Yao, Zhi-Chao [1 ]
Zhao, Hong-Yang [1 ]
Ma, Zhi-Bin [1 ,3 ]
Tao, Hong [1 ]
Tu, Ya-Fang [2 ]
Tian, Yu [2 ]
Zhou, Di [2 ]
Han, Yi-Bo [4 ]
机构：
[1] Wuhan Inst Technol, Sch Mat Sci & Engn, Hubei Key Lab Plasma Chem & Adv Mat, Wuhan 430205, Peoples R China
[2] Jianghan Univ, Sch Phys & Informat Engn, Key Lab Optoelect Chem Mat & Devices, Minist Educ, Wuhan 430056, Peoples R China
[3] Huanggang Normal Univ, Huanggang 436100, Peoples R China
[4] Huazhong Univ Sci & Technol, Wuhan High Magnet Field Ctr, Wuhan 430074, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2020年 / 527卷
基金：
中国国家自然科学基金;
关键词：
Core-shell nanorods; Ultraviolet photodetector; SnO2; Localized excitons; ZnO; EXCITON LOCALIZATION; OPTICAL-PROPERTIES; ELECTROLUMINESCENCE; PHOTORESPONSE; RESPONSIVITY; IMPROVEMENT; NANOWIRES; EMISSION;
D O I：
10.1016/j.apsusc.2020.146923
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
ZnO/SnO2 core-shell nanorod arrays (CSNAs) were synthesized by a facile preparation method. Compared with bare ZnO nanorod arrays (NAs), the near-band-edge photoluminescence (PL) emission was significantly enhanced by coating with SnO2 shell layer. The photoresponse performance of the ultraviolet (UV) photodetector (PD) based on ZnO/SnO2 CSNAs was further investigated. The responsivity and specific detectivity were estimated to be 28.5 (+/- 0.6) A.W-1 and 2.9 (+/- 0.1) x 10(14) cm.Hz(1/2).W-1, which were much better than those of the PD based on bare ZnO NAs. Moreover, the ZnO/SnO2 heterojunction PD also exhibited improved response and recovery times. The localized states introduced by nanocrystalline SnO2 shell layer could effectively prevent the excitons from being trapped by defect states, resulting in the enhancement of the UV emission and photoresponse performance.
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页数：7
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