Self‐Powered Photodetector Based on Perovskite/Ge Heterojunction with High Responsivity

Self‐powered photodetectors (SPDs) are regarded as a new type of photodetectors without external energy sources, exhibiting great potential in the next generation of image sensing, biological detection, and robotics. Here, single crystal CH(NH2)2PbBr3 (FAPbBr3) perovskite with a low trap density of...

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Bibliographic Details
Published in:Advanced materials technologies 2024-04, Vol.9 (8), p.n/a
Main Authors: Wang, Zeshu, Geng, Xiangshun, Jin, Jialun, Zhang, Peigen, Zhang, Li, Li, Yuanyuan, Du, Jingbo, He, Yichu, Zhang, Minshu, Peng, Jiali, Qin, Ken, Dun, Guanhua, Wang, Chunlin, Tian, He, Xie, Dan, Yang, Yi, Ren, Tian‐Ling
Format: Article
Language:English
Subjects:
FAPbBr3, heterojunction
high responsivity
integration
self‐powered photodetectors
single‐crystal perovskites
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Summary:Self‐powered photodetectors (SPDs) are regarded as a new type of photodetectors without external energy sources, exhibiting great potential in the next generation of image sensing, biological detection, and robotics. Here, single crystal CH(NH2)2PbBr3 (FAPbBr3) perovskite with a low trap density of 1.64 × 109 cm−3 is directly integrated onto single crystal germanium (Ge). The band structure of the heterojunction belongs to type‐II alignment type, which is beneficial to the achievement of high responsivity. Therefore, the fabricated Au/FAPbBr3/Ge/Au detector exhibits a high responsivity of 0.33 A W−1, detectivity up to 3.83 × 1011 Jones and relatively fast decay time of 4.94 ms without external bias under 520 nm laser illumination. In addition, a prototype of an imaging system is set up utilizing the photodetector as a sensing pixel, from which the imaging function is verified. This work demonstrates a facile strategy for designing high‐performance SPDs. In this work, CH(NH2)2PbBr3 (FAPbBr3)/Ge‐based heterojunction and self‐powered photodetector are fabricated. The heterojunction belongs to the type‐II heterostructure, which is beneficial to the achievement of high responsivity. Based on the as‐prepared heterojunction, the self‐powered photodetector exhibits outstanding performance with a high responsivity up to 0.33 A W‐1 without external bias, surpassing the vast majority of reported self‐powered perovskite detectors.
ISSN:2365-709X
2365-709X
DOI:10.1002/admt.202301819