Spraying Perovskite Intermediate Enabling Inch‐Scale Microwire Film Fabrication for Integration Compatible Efficient‐Photodetectors Array

Abstract Metal halide perovskite microwires (MWs) have emerged as promising photoactive materials for highly efficient photodetectors (PDs). However, large‐scale MWs film fabrication is still a formidable challenge for achieving integration compatible perovskite PDs arrays, owing to precipitation and structure crushing of MWs during deposition and annealing. Herein, a strategy of fabrication of inch‐scale perovskite MWs films is presented by depositing perovskite intermediate suspension through spray‐coating, which addresses the trade‐off present between the high flatness of MWs film and its large‐scale fabrication. The single crystalline perovskite MWs weave a film with high enough flatness rendering narrow performance distribution of high efficiency on the 7 × 7 PDs arrays. The formamidinium lead iodide (FAPbI 3 ) PDs arrays show average responsivity and detectivity of (1.60 ± 0.46) A W −1 and (1.49 ± 0.50) × 10 12 Jones. The methanaminium lead iodide (MAPbI 3 ) PDs arrays show average responsivity and detectivity of (0.065 ± 0.046) A W −1 and (2.54 ± 0.77) × 10 11 Jones. The champion PDs based on FAPbI 3 MWs film and MAPbI 3 MWs film show detectivity of 1.26 × 10 13 and 9.67 × 10 11 Jones, which are much higher than that of corresponding polycrystalline films and located on the top ranking of similar devices.