Solid-state synthesis of high-purity mixed-chalcogenide perovskites
Year: 2026
Type: preprint
Abstract: Recently, chalcogenide perovskites that are fully inorganic and composed of earth-abundant elements are emerging as non-toxic alternatives to established lead-halide perovskite materials. However, chalcogenide perovskite compositions relevant for optoelectronic applications such as solar cells remain largely unexplored due to the complex, high-temperature synthesis routes involved and difficulties in obtaining high purities. Here, we present a new solid-state synthesis route for facile fabrication of mixed-chalcogenide perovskite powders BaZr(S 1−x Se x ) 3 , where 0 ≤ x ≤ 0.3. We obtain high-purity chalcogenide perovskite powders at moderate temperatures (600 ◦ C) and short reaction times (24 hours). We demonstrate that precursor selection and chalcogen stoichiometry can effectively be used to control the perovskite composition. By increasing Se content (x), the band gaps of the mixed-chalcogenide perovskites can be controllably tuned from 1.83 to 1.58 eV, spanning the desired range for single-and multi-junction solar cells. Broadly, our findings establish a generalisable synthesis method for preparing several mixed-chalcogenide perovskite compositions, including BaZr(S 1−x Se x ) 3 and BaHf(S 1−x Se x ) 3 .
Source: ChemRxiv
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7214102071