All-Perovskite Photodetector with Fast Response

Abstract

Perovskites have attracted substantial attention on account of their excellent physical properties and simple preparation process. Here we demonstrated an improved photodetector based on solution-processing organic-inorganic hybrid perovskite CH3NH3PbI3−xClx layer decorated with CsPbBr3 perovskite quantum dots. The CH3NH3PbI3−xClx-CsPbBr3 photodetector was operated in a visible light region, which appeared high responsivity (R = 0.39 A/W), detectivity (D* = 5.43 × 109 Jones), carrier mobility (μp = 172 cm2 V−1 s−1 and μn = 216 cm2 V−1 s−1), and fast response (rise time 121 μs and fall time 107 μs). The CH3NH3PbI3−xClx-CsPbBr3 heterostructure is anticipated to find comprehensive applications in future high-performance photoelectronic devices.