作者机构：
[Zhang, Jianqiang; Zhang, Guoping] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Ding, Liming; Pan, Xiyan; Sun, Jie] Natl Ctr Nanosci & Technol, Ctr Excellence Nanosci CAS, Key Lab Nanosyst & Hierarch Fabricat CAS, Beijing 100190, Peoples R China.;[Pan, Xiyan] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Zhou, Hai] Dongguan Univ Technol, Int Sch Microelect, Dongguan 523808, Peoples R China.
通讯机构：
[Ding, LM ] N;[Zhang, GP ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;Natl Ctr Nanosci & Technol, Ctr Excellence Nanosci CAS, Key Lab Nanosyst & Hierarch Fabricat CAS, Beijing 100190, Peoples R China.
关键词：
all-inorganic perovskite;cation exchange;CsPbBr3;photodetectors;laser eavesdropping systems
摘要：
The CsPbBr3 photodetector prepared by an in situ cation exchange method exhibits exceptional performance in terms of detectivity, responsivity, and response time. Once integrated into the laser eavesdropping system, it can skillfully capture the sound signals from distant targets, ultimately enabling the successful realization of laser eavesdropping through the mutual conversion of optical and electrical signals. Abstract Owing to the absence of organic cations, all‐inorganic perovskite exhibits superior thermal and irradiation stability compared to organic‐inorganic perovskite. However, it is difficult for the traditional solution method to produce pinhole‐free and phase‐pure all‐inorganic perovskite films, which hinders its application. Here, a method of in situ A‐site cation exchange to synthesize CsPbBr3 films is introduced. The MAPbBr3 films are treated with CsAc solution to initiate cation exchange, where the intermediate product MAAc plays a crucial role in guiding grain growth during evaporation, resulting in the production of pinhole‐free and phase‐pure CsPbBr3 films. The self‐powered photodetector, based on compact and pinhole‐free CsPbBr3 film, exhibits excellent performance with an LDR of 126.7 dB, a detectivity of 1.1 × 1013 Jones, and a rise/decay time of 2.9/25.1 µs. Furthermore, the photodetector maintains over 90% of its original performance after a 2500 s irradiation test and a 30‐day air exposure test. Benefiting from the exceptional device performance and stability, the photodetector proves to be a valuable component in the laser eavesdropping system.
