Research progress of self-powered photodetectors based on halide perovskites

[Display omitted] •Recent progress in self-powered photodetectors using halide perovskites is reviewed.•Four typical mechanisms to realized self-powered function are discussed.•Strategies for improving the device performance are summarized.•Applications in image sensing, health monitoring, and light communication are reviewed.•Challenges and further development directions are proposed. Self-powered photodetectors (SPPDs) represent a significant advancement in next-generation optoelectronic devices because of their inherent advantages such as wireless operation, low energy consumption, lightweight design, and sustainability. Halide perovskites (HPs) have been extensively utilized in SPPDs for high absorption coefficient, tunable bandgap, high carrier mobility, and long carrier diffusion length. This review provides a comprehensive summary of the latest research on HP-based SPPDs, categorizing them into Schottky junction, p–n junction, p–i–n junction, and integrated SPPDs. We discuss the operating mechanisms of these HP-based SPPDs, strategies to enhance their performance, including additive and interface engineering, and the pyro-phototronic and piezo-phototronic effects. Additionally, we present the applications of HP-based SPPDs in image sensing, wearable health monitoring, and optical communication. Finally, we highlight the current challenges and potential opportunities in this field, emphasizing the potential of HP-based SPPDs in advancing optoelectronic technologies.