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.
出处
《InfoMat》
SCIE
CAS
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。
