High-performance self-powered ultraviolet photodetector based on BiOCl/TiO2 heterojunctions: Carrier engineering of TiO2

被引：27

作者：

Zhang, Qiuyang ^{[1
]}

Xu, Jianping ^{[1
]}

Li, Menghan ^{[1
]}

Chen, Jing ^{[2
,3
]}

Xu, Jianghua ^{[2
,3
]}

Zheng, Qin ^{[1
]}

Shi, Shaobo ^{[4
]}

Kong, Lina ^{[2
,3
]}

Zhang, Xiaosong ^{[2
,3
]}

Li, Lan ^{[2
,3
]}

机构：

[1] Tianjin Univ Technol, Sch Sci, Tianjin 300384, Peoples R China

[2] Tianjin Univ Technol, Sch Mat Sci & Engn, Key Lab Display Mat & Photoelect Devices, Minist Educ, Tianjin 300384, Peoples R China

[3] Tianjin Univ Technol, Tianjin Key Lab Photoelect Mat & Devices, Tianjin 300384, Peoples R China

[4] Tianjin Univ Technol & Educ, Sch Sci, Tianjin 300222, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2022年 / 592卷

基金：

中国国家自然科学基金;

关键词：

TiO2; BiOCl; Heterojunction interface; Self-powered photodetectors; UV PHOTODETECTORS; FIELD;

D O I：

10.1016/j.apsusc.2022.153350

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：

For low-energy photoelectric devices, it is essential to develop self-powered photodetectors (PDs), because it can work independently, wirelessly and sustainably. The heterojunction PDs based on BiOCl nanoflakes (NFs) and anatase TiO2 film fabricated by the hydrothermal method demonstrate the excellent ultraviolet (UV) photo response properties without external power supply. The strong built-in electric field formed at the heterojunction interface and the efficient carrier transmission characteristic of TiO2 film can improve the self-powered performance of PDs. The optimized heterojunction device with TiO2 film grown for 1.75 h exhibits a high photocurrent-to-dark current ratio of 10(3), responsivity of 0.17 A/W, remarkable detectivity of 1.3 x 10(12) Jones, linear dynamic range of 70 dB and fast response speed of 23 ms under 0 V bias and weak UV light irradiation (340 nm, 0.18 mW/cm(2)). These results demonstrate that the BiOCl/TiO2 heterojunction devices have great application potential in the future UV communications systems.

引用

页数：11

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