In-situ fabricated and plasmonic enhanced MACsPbBr3-polymer composite perovskite film based UV photodetector

Abstract

Organic-inorganic hybrid perovskite is being extensively applied to optoelectronics. However, the complex fabrication techniques, long-term instability, inefficient charge transportation; poor surface coverage hinders the expansion of its applications. Herein, we report for the first time the in-situ synthesis of MACsPbBr3-perovskite crystals in polymer-matrix to act as a light absorber for efficient ultraviolet light detection. The devices fabricated with the MACsPbBr3-perovskite films showed a maximum photocurrent of 8.9 × 10−6, a dark current of 1.7 × 10−11 A, responsivity of 45.75 AW−1, detectivity of 1.05 × 1013 Jones and on/off ratio >105 at 0 V, under the illumination of 0.28 mW cm−2. The plasmonic enhancement was explored by fabricating PDs on (gold nanoparticles) AuNPs/ZnO structure, which exhibited photocurrent enhancement (10−5), ascribed to the huge localized electric field induced by the surface plasmon resonance, scattering, and reflectance from AuNPs and structured ZnO surface, and improved the responsivity (55.91 AW−1) and on/off ration (>106) by 1.12-fold and 10-fold. And the formed Schottky barrier between Pero and AuNPs/ZnO region could lead to the reduced dark current (10−13 A) and improved detectivity (7.91 × 1014 Jones). This study offers a different pathway for the designing of high-performance plasmonic PDs.