Photoluminescence enhancement of quasi-2D perovskite films by plasmonic silver nanoparticles

Abstract

Metal halide perovskites have emerged as leading materials in luminescence and photovoltaic research due to their unique tunable optical properties, with applications spanning light sources, sensors and solar cells. Recently, quasi-2D perovskites, characterized by their enhanced stability and superior moisture resistance, have gained attention for their potential in ambient-condition applications. Enhancing the properties of these materials to enable the development of highly efficient devices that can operate under ambient conditions has become a critical and highly active area of research. This study investigates the photoluminescence (PL) enhancement of (PEA)₂(MA)_n−1Pb_nI_3n+1 perovskite films, with n = 3, 5, 10, through the deposition of silver nanoparticles (Ag NPs) via sputtering. The size distribution and absorbance spectrum of Ag NPs were systematically analyzed to identify conditions for maximum PL amplification. The results show that the strongest PL enhancement, a 7.4-fold increase, was achieved for n = 10 films coated with Ag NPs exhibiting a plasmonic resonance peak at 528 nm and a size distribution peak at 8 nm. This study provides critical insights into the interaction between plasmonic nanostructures and quasi-2D perovskites, preparing the path for the development of highly stable and highly efficient light-emitting devices and solar cells.