Single-crystal-like all-inorganic CsPbBr3 Films for high-performance, stable photodiodes

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Abstract
All-inorganic halide perovskites have attracted significant attention for photodetection applications owing to their excellent optical and electrical properties, together with superior stability against chemical and radiation-induced degradation. Here, we report a facile solution-processing strategy for synthesizing large-area (up to 8.5 × 8 cm2) single-crystal-like CsPbBr3 films. Compared with bulk single crystals, these films offer advantages including large-area scalability, controllable thickness, and improved device integration while maintaining comparable optoelectronic properties. The as-prepared films exhibit a low trap density of 9.4 × 1010 cm-3, enabling a high carrier mobility of 66 cm2 V-1 s-1 and an outstanding mobility–lifetime product of up to 1.02 × 10-3 cm2 V-1. Photodiodes based on these films demonstrate excellent performance, including a high responsivity of 432 mA W-1, a detectivity of 2.4 × 1011 Jones, and a fast response time of 44 ms. Importantly, the large-area devices exhibit excellent uniformity in responsivity and detectivity across different regions. Moreover, the devices retain over 90% of their initial responsivity after one month of storage under N2 conditions and remain operational after 5 days in air. Stable photocurrent responses under varying laser intensities for up to 20 min further confirm their excellent operational stability.

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