High-performance 1D CsPbBr3/CdS photodetectors

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 characteristics: a high on/off current ratio (1.07 x 10(5)), a responsivity of up to 1.35 x 10(4) A<middle dot>W-1, specific detectivity of 5.94 x 10(15) Jones, external quantum efficiency of 2.83 x 10(4)% and rapid response/recovery time (400 mu s/3 ms). These superior performances stem from the exceptional 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 carrier separation while suppressing recombination. Importantly, 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.