Research Progress on the Stability of Organic–Inorganic Halide Perovskite Photodetectors in a Humid Environment Through the Modification of Perovskite Layers

Organic–inorganic halide perovskite photodetectors, with the advantage of solution-processing fabrication, are a class of revolutionary optoelectronic devices that are promising for various practical applications. However, defects in the organic–inorganic halide perovskite layer result in their decomposition in a humid environment. Therefore, the long-term stability of perovskite layers is critical to the development of organic–inorganic perovskite photodetectors for practical applications. Here, we have reviewed the mechanisms of device decomposition in a humid environment and the strategies to improve perovskite layer stability including surface defect passivation, water pathway reduction, and perovskite structure optimization. In addition, this review also emphasizes the preparation of low-dimensional perovskites to improve the stability of photodetectors in humid environments. This review summarizes effective strategies to improve the stability of the perovskite layer in a humid environment in recent years and provides suggestions for the development of the long-term stability of organic–inorganic halide perovskite photodetectors. Graphical Abstract