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Abstract The emergence of all‐inorganic perovskite CsPbBr 3 has ignited significant interest in optoelectronic devices, However, CsPbBr 3 thin film‐based photodetectors face performance limitations due to grain boundaries and defect density. To address these challenges, we introduce a novel type II heterojunction photodetector utilizing CsPbBr 3 microwires (MWs) and CdS nanoribbons (NBs). Remarkably, this photodetector exhibits exceptional characteristics: a high on/off current ratio (1.07 × 10 5 ), a responsivity of up to 1.35 × 10 4 A·W −1 , specific detectivity of 5.94 × 10 15 Jones, external quantum efficiency of 2.83 × 10 4 % and rapid response/recovery time (400 μs/3 ms). These superior performances stem from the exceptional crystalline quality of CsPbBr 3 MWs and CdS NBs, coupled with the establishment of a type II band alignment at their interface. This configuration enables efficient carrier separation while suppressing recombination. Importantly, 1D CsPbBr 3 MW/CdS NB heterojunction photodetectors demonstrate reliable imaging capabilities under visible light illumination. Our findings present an innovative solution for high‐performance perovskite‐based photodetectors, holding promise for future commercial applications.
Xiang et al. (Wed,) studied this question.
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