Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.396
Publication date: 16th December 2024
Cs2TiBr6, a promising lead-free and earth-abundant double perovskite, exhibits excellent photovoltaic and optoelectronic potential due to its 1.8 eV bandgap and theoretical stability under various conditions. Despite its advantages, challenges in conventional synthesis—such as high temperature, pressure, and solubility issues—have limited its practical application. Additionally, its susceptibility to air-induced degradation raises further concerns about its stability.
This work introduces a novel, microwave-assisted synthesis method that significantly reduces time, temperature, pressure, and cost while maintaining structural stability under diverse atmospheric conditions, including air, oxygen, white light, and temperatures exceeding 130°C. A gradual cation exchange process was implemented to enhance stability by substituting Ti4+ with Sn4+ in the efficient microwave-assisted synthesis method, developing a double perovskite Cs2SnxTi1-xBr6 type. A systematic study of Sn-doping revealed improved air stability for over a week, uniform polygonal crystal morphology, and a slight bandgap broadening.
This efficient and sustainable synthesis approach offers a pathway to more durable and environmentally friendly perovskites, unlocking new opportunities for advanced optical and electronic devices.
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