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

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 (FAPbI₃) PDs arrays show average responsivity and detectivity of (1.60 ± 0.46) A W⁻¹ and (1.49 ± 0.50) × 10¹² Jones. The methanaminium lead iodide (MAPbI₃) PDs arrays show average responsivity and detectivity of (0.065 ± 0.046) A W⁻¹ and (2.54 ± 0.77) × 10¹¹ Jones. The champion PDs based on FAPbI₃ MWs film and MAPbI₃ MWs film show detectivity of 1.26 × 10¹³ and 9.67 × 10¹¹ Jones, which are much higher than that of corresponding polycrystalline films and located on the top ranking of similar devices.