Abstract
The emergence of all-inorganic perovskite CsPbBr3 has ignited significant interest in optoelectronic devices,However,CsPbBr3 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 CsPbBr3 microwires(MWs)and CdS nanoribbons(NBs).Remarkably,this photodetector exhibits exceptional char-acteristics:a high on/off current ratio(1.07 × 10 5),a responsivity of up to 1.35 × 10 4 A·W-1,specific detec-tivity of 5.94 x 1015 Jones,external quantum efficiency of 2.83 × 10 4％and rapid response/recovery time(400 μs/3 ms).These superior performances stem from the excep-tional crystalline quality of CsPbBr3 MWs and CdS NBs,coupled with the establishment of a type Ⅱ band alignment at their interface.This configuration enables efficient car-rier separation while suppressing recombination.Impor-tantly,1D CsPbBr3 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.
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