The double-perovskite material Cs2TiBr6 shows excellent photovoltaic potential, making it a promising alternative to lead-based materials. However, its high susceptibility to degradation in air has raised concerns about its practical application. This study introduces an interesting synthesis approach that significantly enhances the stability of Cs2TiBr6 powder. We implemented a gradual cation exchange process by substituting Ti4+ with Sn4+ in the efficient microwave-assisted synthesis method, developing a double perovskite Cs2SnxTi1-xBr6 type. A systematic study of increasing concentration of Sn4+ in Cs2TiBr6 perovskite has been performed to analyze the effect of Sn-doping degree on the chemical and thermal stability of the material and the optical features in both nitrogen and ambient atmospheres, significantly increasing the stability of the material in the air for over a week. Furthermore, introducing Sn4+ results in a more uniform polygonal crystal morphology of the powders and a slight band gap broadening. We show that microwave-assisted synthesis is highly efficient and cost-effective in producing more sustainable lead-free perovskite materials with enhanced stability and desirable electrical characteristics. This work suggests a promising method for synthesizing perovskite materials, opening new routes for scientific research and applications.

Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam Cs Legii 565 Pardubice 53002 Czech Republic

Central European Institute of Technology Brno University of Technology Purkyňova 123 Brno 612 00 Czech Republic

Facultad de Ingeniería Química División de Estudios de Posgrado Universidad Michoacana de San Nicolás de Hidalgo Edificio Q Edificio U Ciudad Universitaria Morelia Mich C P 58030 México

Institute of Advanced Materials Universitat Jaume 1 Av Sos Baynat s n 12071 Castelló de la Plana España

Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44 52 01 224 Warsaw Poland

Instituto de Investigación en Metalurgia y Materiales Universidad Michoacana de San Nicolás de Hidalgo Edificio U Ciudad Universitaria Morelia Mich C P 58030 México

Unidad Académica de Ingeniería Eléctrica Universidad Autónoma de Zacatecas Jardín Juárez 147 Zacatecas Centro Zacatecas Zacatecas C P 98000 México

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