High-Performance CsPbBr Quantum Dot/ZTO Heterojunction Phototransistor with Enhanced Stability and Responsivity.

Although all inorganic metal halide perovskite quantum dots (QDs) have shown great potential in photodetectors, many reported devices still suffer from low responsivity due to poor mobility and high defect densities. To overcome these challenges, heterojunction structures that separate electron and hole pathways have emerged as a promising approach to improve the responsivity by reducing radiative recombination. Two-dimensional materials such as graphene and MoS have been integrated with perovskites to enhance performance; however, these materials often lead to high dark-state currents, which hinder the on/off ratios in photodetectors.