Recent progress in the patterning of perovskite films for photodetector applications.

Photodetectors, as the core devices for optical signal conversion, need to balance high efficiency, fast response, and low-cost fabrication. Perovskite, with its advantages of high carrier mobility and tunable band gaps, have become an ideal alternative to silicon-based materials. This paper systematically reviews the progress in the patterned fabrication techniques and device construction of perovskite photodetectors across various dimensional material systems. First, it introduces five mainstream patterned fabrication methods for perovskites: template-confined growth, inkjet printing, vapor deposition, seed-induced growth, and conventional photolithography. Then, the latest research on image sensors based on perovskite materials in different dimensions is discussed. Following this, the paper highlights two promising application directions with great development potential: flexible wearable devices and electrochemical vision systems. Finally, the challenges and potential solutions for the future development of patterned perovskite photodetectors are presented to guide the development of high-performance perovskite optoelectronic devices.