Regulating The Electronic Configuration of Low‐Dimensional Hybrid Perovskites via Organic Cations for Self‐Powered Ultraviolet Photodetectors

Abstract Ultraviolet photodetectors (UPDs) based on low‐dimensional halide perovskites have undergone rapid development. Here, regulation of the electronic configuration of low‐dimensional hybrid perovskites are reported via organic cations for self‐powered UPDs. For the first time, it is determine that the rational design of organic cation phenyl alkylammonium can effectively prevent phonon scattering thus increasing charge carrier extraction in low dimensional lead chlorine perovskite thin‐films. As a result, the exciton‐binding energy can be reduced to 62.91 meV in (PMA) 2 PbCl 4 perovskite films with a charge‐carrier mobility of 0.335 cm 2 V −1 s −1 . The fabricated (PMA) 2 PbCl 4 ‐based self‐powered UPDs has achieved a high detectivity of 6.32 × 10 13 jones with a low noise current of 0.35 pA Hz −1/2 under zero bias. A further demonstration of images with high UV to visible light rejection ratio under weak‐light illumination of 70 nW cm −2 highlights the feasible potential application of low‐dimensional perovskite.