Light‐Tunable 2D Esaki Diode Photodetector with Well‐Balanced High Detectivity and Response Speed

Van der Waals (vdW) heterojunctions composed of 2D layered materials exhibit novel physical phenomena that can power a range of electronic and photonic applications. Here, the first demonstration of the light switchable mechanism between the rectifier diode and Esaki diode in SnS2/WSe2-black phosphorus (BP) vdW heterojunctions is presented. In this design, the photogating effect of WSe2-BP junction is employed as the switch toggle between rectifier diode and Esaki diode. Based on this light switchable mechanism, a super-linear photocurrent-power dependence is observed and a high-performance photodetector with high detectivity (5.1 × 1011 Jones) and rapid response speed (<112 us) is obtained. A feasible strategy for a well-balanced photodetector with high detectivity and response speed in the vdW heterojunction is provided.