A high-performance photodetector based on an inorganic perovskite–ZnO heterostructure

Abstract

All-inorganic perovskites, such as CsPbX₃ (X = Cl, Br, I), have recently emerged as highly promising optoelectronic materials due to their excellent physical properties, especially their higher thermal stability. However, the performance of a CsPbX₃-based photodetector is worse than its counterparts based on organic–inorganic hybrid perovskites. In this work, we demonstrate flexible high performance photodetectors based on the CsPbBr₃/ZnO heterostructure using solution-processesing. Owing to the interfacial charge transfer from perovskite to ZnO, the photocurrent of devices was enhanced by more than one order of magnitude after the introduction of a ZnO layer. The CsPbBr₃/ZnO heterostructure photodetectors exhibited high sensitivity with an on/off ratio of >10⁴ under 450 nm light illumination and a high photoresponsivity of 4.25 A W⁻¹. Furthermore, CsPbBr₃/ZnO photodetectors with excellent stability and outstanding flexibility were also demonstrated. This work demonstrates that CsPbBr₃/ZnO heterostructures are promising for the construction of high-performance photodetectors and other optoelectronic devices.