Structural engineering of single-crystal-like perovskite nanocrystals for ultrasensitive photodetector applications

Nanostructured organic-inorganic hybrid perovskite materials have attracted much attention due to their excellent performance in optoelectronics and facile solution-processability compared with their bulk and thin-film counterparts. Herein, we successfully synthesized well-defined one-dimensional single-crystalline perovskite nanomaterials for the application of photodetectors (PDs). We controlled synthesis parameters, such as reaction time and mechanical agitations, to deviate crystal structures into quantum dots, nanowires, and nanorods, which are studied comparatively and related to their optoelectrical properties. In particular, we demonstrate that the perovskite nanorods are structured with single-crystal-like molecular orientation, which significantly enhances PD performances compared to nanowires and quantum dots. We constructed PDs using the perovskite nanorods that exhibited excellent photodetection performance with a responsivity of 40 A W⁻¹, external quantum efficiency of 1.3 × 10⁴%, and detectivity of 3.3 × 10¹⁴ Jones, respectively, with exceptional device stability over one-month storage.