Abstract
Recent advances in lead-free perovskite have opened a vast doorway for sensors and energy harvesting applications. However, toxicity, complex synthesis process, and stability were the major obstacles to their success. To address these issues, here we report an effective synthesis of Ce-doped lead-free metal halide in a simple, water-assisted method. Our process reduces the use of harmful organic/inorganic solvents, enabling easy and cost-effective mass production. As-synthesized Ce-doped Cs3MnBr5 exhibits efficient ultraviolet (UV) absorption while being blind to the visible spectrum. The introduction of the Ce3+ dopant in the metal halide lattice shows a broad-band response to UV light with violet emission spectra at 387 and 419 nm. The material also displays a promising PL lifetime of 0.0142 ms with good stability under ambient storage conditions. A UV photodetector is designed based on the Ce-doped Cs3MnBr5 thin film, which shows a promising responsivity of 1.64 A/W with a detectivity of 5.3 × 1011 jones. This study demonstrates an eco-friendly, cost-effective strategy for fabricating a UV photodetector for novel and advanced UV optoelectronic systems.
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