Enhancement of perovskite photoluminescence characterizations by using lithography-free metal nanostructures

To date, organic–inorganic metal halide perovskite material has become an emerging research topic for scientists to alternate the semiconductor material in the optoelectronic applications. However, the photoluminescence (PL) efficiency of perovskite material is quite low, which impacts the performance of perovskite-based optoelectronic devices. Here, we propose and demonstrate an effective approach to enhance the PL efficiency of perovskite material. We utilize the metal nanostructures fabricated on the perovskite surface. Metal nanostructures possess extraordinary electromagnetic properties, e.g., easily controlled the amplitude, phase, and polarization of the incident light, which can be utilized to enhance the PL performance of the perovskite material. The intensity and spectral bandwidth of the PL spectrum could be enhanced significantly via metal nanostructures. The full width at half maximum of PL spectral bandwidth could be narrowed to several nanometers. This nanostructure-enhanced PL characterization of the perovskite material exhibits better monochromaticity and provides the simple, cost-effective, and potentially scalable method for the development of high-efficiency light emitting diodes, solar cells, photodetectors, etc.