A transparent, self-powered photodetector based on p-CuI/n-TiO2 heterojunction film with high on-off ratio

被引：31
作者：
Zuo, Chaolei [1 ]
Cai, Sa [1 ]
Li, Ziliang [1 ]
Fang, Xiaosheng [1 ]
机构：
[1] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China
来源：
NANOTECHNOLOGY | 2022年 / 33卷 / 10期
基金：
中国国家自然科学基金;
关键词：
photodetector; transparent; self-powered; heterojunction; copper iodine; CUI;
D O I：
10.1088/1361-6528/ac3e35
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ultraviolet(UV) photodetectors(PDs) can monitor UV radiation, enabling it to be effective for many applications, such as communication, imaging and sensing. The rapid progress on portable and wearable optoelectronic devices places a great demand on self-powered PDs. However, high-performance self-powered PDs are still limited. Herein we display a transparent and self-powered PD based on a p-CuI/n-TiO2 heterojunction, which exhibits a high on-off ratio (similar to 10(4) at 310 nm) and a fast response speed (rise time/decay time = 0.11 ms/0.72 ms) without bias. Moreover, the device shows an excellent UV-selective sensitivity as a solar-blind UV PD with a high UV/visible rejection ratio (R (300 nm)/R (400 nm) = 5.3 x 10(2)), which can be ascribed to the wide bandgaps of CuI and TiO2. This work provides a feasible route for the construction of transparent, self-powered PDs based on p-n heterojunctions.
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页数：9
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