Method for selective surface engineering of perovskite microwire arrays

Abstract

The surface of low-dimensional perovskites plays a crucial role in determining their intrinsic properties. Thus, specific surfaces may be designed to obtain a desired characteristic and/or a functional structure. Further, surface passivation could also be applied to stabilize and optimize the state-of-the-art perovskite-based optoelectronics. CsPbBr3 microwires parallel arrays with specific (100)-terminated crystal planes were designed and fabricated to have excellent photodetection performance with long-term environment stability over 3000 hours. Further, environmental oxygen may be used to passivate the Br-vacancy-related trap states on the (100) surface and to create charge carrier nanochannels to enhance the (opto)electronic properties. The coupling effects between oxygen species and the specific terminated crystal planes of perovskites highlight the importance of surface engineering for designing and optimizing perovskite-based devices.

Dependencies are inferred from the claim text.