Photoconductive Detectors Based on Perovskite Quantum Dots or Nanocrystals: From Lead-Based System to Lead-Free System

Abstract

Recently, halide perovskite colloidal quantum dots (QDs) or nanocrystals (NCs) have emerged as promising candidates for high-performance and low-cost photodetectors due to their distinct advantages like low-temperature solution processability, variable bandgap, large light absorption, and superior phase stability. However, issues such as toxicity of lead element have greatly hindered the possibility of their practical applications. Therefore, many researchers chose low-toxic or nontoxic elements to replace lead element and made photodetector applications a reality. Herein, we firstly aimed to give an introduction of the preparation of lead-based and lead-free perovskite QDs/NCs, including the different synthesis methods, bandgap engineering, and post-synthetic treatments. And then, we reviewed the recent progresses of lead-based and lead-free halide perovskite QDs/NCs photoconductive photodetectors. Finally, we presented the major challenges that need to be addressed in the future and the outlooks of perovskite QDs/NCs photodetectors. It is hoped that the summary of the research status of perovskite QDs/NCs photodetectors will put forward to the development of this field.