Dual‐Mode Photoresponse via Photoconductive and Thermally Induced Interfacial Modulation in MoS 2 /Perovskite Heterostructures
Jiaqi Tang, Dongdong Zhao, Kaiyu Hu, Yepei Mo, Qijian Wang, Xiaojun Pan, Jiaqi He, Zeping He, Jia Long, Yu Zhang, Jiarun Ding, Wenchao Gao, Zhifang Liu, Muhong Wu, Caofeng PanABSTRACT
Next‐generation optoelectronic systems demand photodetectors capable of both wavelength‐dependent and spectrally selective response, particularly under low‐light or long‐wavelength conditions. Conventional photodetectors based on a single photoresponse mechanism face inherent limitations in dual‐mode photoresponse and wavelength discrimination capability. Herein, we report a dual‐mode photodetector that integrates photoconductive and thermally induced transient responses within a monolayer MoS 2 /MAPbBr 3 perovskite heterostructure. Under a low external bias, green light induces a steady‐state photoconductive current in the MoS 2 channel, while red light triggers a transient current induced by thermally driven interfacial modulation at the MoS 2 /MAPbBr 3 interface. This wavelength‐dependent dual‐response enables intrinsic spectral selectivity and signal discrimination. Leveraging these coupled dynamics, the device demonstrates real‐time recognition of red‐green optical numeric patterns via a simple signal classification protocol. Our findings unveil the synergistic interplay between photoconductive and thermally induced mechanisms in TMD‐perovskite hybrids, offering a promising platform for wavelength‐dependent optoelectronic sensing and signal classification systems.