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

• The double cation halide perovskite MACsPbBr 3 embedded in polymers constitute the film with improved surface coverage, surface passivation , light absorption, stability, and charge carrier lifetime. • The introduction of AuNPs enhances the light absorption and extraction efficiency of carriers to further enhance the device performance. • The incorporation of MAPbBr 3 -Pero+PVDF in CsPbBr 3 -Pero increased surface coverage with and a large number of smooth crystals surrounded by MA-Pero+PVDF crystal, which decreased surface roughness to provide better interfacial contact with the top electrode. • The addition of PVDF polymer reduced dark current the photocurrent and the addition of PVP improved uniform dispersivity as compared to PEO and improved photocurrent. • The optimized plasmonic enhanced MACsPbBr 3 -polymer-based PD has achieved a high photo-to-dark current ratio, responsivity, and specific detectivity >10 6 , 55.91 AW −1, and 7.91×10 14 Jones, which is 1.12-fold and 10-folds greater than that for the no-plasmonic device. 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 MACsPbBr 3 -perovskite crystals in polymer-matrix to act as a light absorber for efficient ultraviolet light detection. The devices fabricated with the MACsPbBr 3 -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 × 10 13 Jones and on/off ratio >10 5 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 (>10 6 ) 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 × 10 14 Jones). This study offers a different pathway for the designing of high-performance plasmonic PDs. We have utilized MACsPbBr 3 +PVDF+PVP (Pero+Polymer) composite film for efficient UV-photo detection. Also, we have employed the same composite film to investigate plasmonic enhanced photodetector. The addition of MA-Pero in the PVDF matrix not only improves the surface coverage but also reduces the dark current due to PVDF. MA-Pero+PVDF combined with Cs-Pero+PVP overall improves surface coverage, surface passivation, UV-light absorption, stability, and charge carrier lifetime. Preparing this composite film on the structured layer of AuNPs/ZnO improves not only absorption but the carrier transportation in the Pero-polymer composite film to enhance the detection and response of photodetector due to the additional effect of scatterings, reflectance, and electric field enhancement. Such photodetector provides efficient photodetection at 410 nm as compared to conventional perovskite film.