Self-powered bifunctional perovskite photodetectors with both broadband and narrowband photoresponse  

作　　者：Wenjie Cheng Wei Tian Fengren Cao Liang Li 

机构地区：[1]School of Physical Science and Technology,Jiangsu Key Laboratory of Thin Films,Soochow University,Suzhou,People's Republic of China

出　　处：《InfoMat》2022年第11期119-131,共13页信息材料（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:52025028,52072254,51872191,51772197,52002258;Natural Science Foundation of Jiangsu Province,Grant/Award Number:BK20200877;Key University Science Research Project of Jiangsu Province,Grant/Award Number:21KJA430005;Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions;State Key Laboratory of Solidification Processing in NPU,Grant/Award Number:SKLSP202219。

摘　　要：Photodetectors generally operate exclusively in either the broadband or narrowband.Developing bifunctional photodetectors that can detect photons in both broadband and narrowband would bring significant versatility to the optoelectronic platform.Nevertheless,the design of bifunctional integrated devices remains challenging due to the differentiated strategies with respect to device structure and material combination.Herein,we propose introducing polyvinylpyrrolidone to increase the viscosity of the perovskite precursor solution,which introduces abundant defects and cavities into the perovskite film while maintaining a relatively low film thickness.Then,we use methylamine gas to postprocess the middle area of the film to promote directional recrystallization and densification,thereby realizing narrowband and broadband dualfunction photodetection in a single device at zero bias.Both ends of the film exhibit a near-infrared peak response at 780 nm with a narrow full-width at half maximum of approximately 30 nm without an external bias.The middle broadband photodetector exhibits a high responsivity of 329 mA W^(-1)and EQE up to 52.46%at 780 nm.We make full use of narrow-band wavelength selective detection and broadband full-spectrum detection to achieve double encryption during signal transmission.This work represents an important step toward the realization of perovskite-based multifunctional integrated devices.

关 键 词：bifunctional device double encryption narrow FWHM perovskite photodetector 

分 类 号：TN215[电子电信—物理电子学]