Ultraviolet Photodetectors Based on CH3NH3PbCl3 Perovskite Quantum Dots‐Doped Poly(triarylamine)

Abstract

Ultraviolet (UV) photodetectors have attracted significant attention because of their wide applications in environment monitoring, flame detecting, missile tracking, and so on. However, commercial UV photodetectors based on wide bandgap inorganic semiconductors normally require high‐vacuum and high‐temperature deposition techniques. To reduce the fabrication cost, solution‐processed organic or hybrid semiconductors are introduced as promising candidates for low‐cost UV detection. Particularly, due to the low cost, flexibility, and chemical variety, organic semiconductors have shown remarkable progress in the past two decades. However, UV photodetectors based on organic active layers are suffering from relatively low responsivity due to the poor charge transport. Therefore, the devices based on organic semiconductors commonly operate at high bias voltage to facilitate the charge transport, and the devices also exhibit large dark current. Herein, the organic UV active layer is doped with perovskite quantum dots (QDs) to improve the device performance. It is found that the responsivity and detectivity can effectively be enhanced by the doping strategy. Furthermore, the influence of doping effect on the charge carrier mobility and temporal response is also investigated, which shows that the mobility can be increased ≈6 times with the effective doping.