High Performance and Broadband photodetectors Based on SnS2/InSe Heterojunction

We reported a broadband photodetector with a spectral range of 365-965 nm, based on a SnS2/InSe vertical heterojunction. In this device, InSe serves as the optical absorption layer, effectively extending the spectral range, while SnS2 functions as the transmission layer, forming a heterojunction with InSe to facilitate separation of electron-hole pairs and enhance the responsivity. The photodetector exhibits a responsivity of 813 A/W under 365 nm. Moreover, it still maintained a high responsivity of 371 A/W, an external quantum efficiency of 1. 3 x 105%, a specific detectivity of 3. 17 x 1012 Jones, and a response time of 27 ms under 965 nm illumination. The above investigation provides a new approach for broadband photodetectors with high responsivity.