All-inorganic perovskite CsPbBr3-based self-powered light-emitting photodetectors with ZnO hollow balls as an ultraviolet response center

Abstract

Self-powered light-emitting photodetectors (SLEPs) can simultaneously transmit and receive information using light, offering huge potential for applications in interactive communication systems. However, high-performance SLEPs are very hard to achieve due to the seriously contradictory principles of carrier transport in SLEPs. In this study, a novel structure based on a ZnO hollow ball/CsPbBr₃ heterojunction, in which ZnO hollow balls function as an ultraviolet (UV) response center and CsPbBr₃ is designed to be a green light-emitting material, is reported as a high-performance SLEP. Since the ZnO hollow balls have superior light trapping characteristics for UV light, the device shows a huge UV response with the on/off ratio and detectivity up to 16 527 and 2.4 × 10¹³ Jones, respectively. Moreover, it displays blue emission with a low threshold voltage because of CsPbBr₃. Compared with the traditional ZnO/GaN structure devices, the device showed enhanced dual-functional performance at various wavelengths due to the insertion of CsPbBr₃, which resulted in a better contact interface and green-light emission center. Our structure separating the light-responsive and emitting active regions avoids the contradictory principles of carrier transport, which may provide new access to gain high-performance dual-functional devices.