Influence of device architectures and mobility on response/recovery time of metal halide perovskites: A review

Abstract

Organic–Inorganic perovskite materials have attracted great interest in the research community for photo-detector and solar energy applications. For various photo-detector applications, the response time is a very important parameter. In telecommunication, a high response speed is required and for this special class of materials, a fast response time in the order of ns has been realized by some authors. The main challenge is their stability. It is established that the response time is primarily controlled by the electron/hole mobility, electrode spacing and the depletion width. In this review, we discuss the recent developments of photo-detector devices composed of mixed halide perovskites and their performance with the main emphasis on the role played by mobility and internally generated electric field to the response/recovery speed. We discuss how the response speed clear relates to charge carrier mobility and depletion width. We further suggest ways on how to improve the response speed to match those of the conventional commercial photo-detectors like Si and InGaAs. We hope this article will find a suitable audience who will utilize this knowledge in the design and construction of ultra-fast photo-detectors.