An Extrinsic Approach Toward Achieving Fast Response and Self-Powered Photodetector

摘要

An extrinsic approach toward achieving fast response and self-poweredphotodetector is reported. It is shown that an organic–inorganic hybrid device(SnSe_2/PEDOT:PSS) not only operates in self-powered mode for infra-redphotodetection but also improves the response time with respect to inorganic(SnSe_2) linear devices. Fast response and recovery time constants of ≈1.33and 1.22 s, respectively, are obtained. Furthermore, the sensitivity is highestat zero bias and the device is stable for over 6 months stored in open aircondition. The observed photo-current, faster response and recovery timeconstants are ascribed to the formation of a strong built-in electric field atthe interface between SnSe_2 and PEDOT:PSS. In a broader view of thesefindings, the device proves its potential as a self-powered photo-detector andthe results reported here can pave the way to design self-powered and fastresponse for other wavelengths.