Hidden spontaneous polarisation in the chalcohalide photovoltaic absorber Sn₂SbS₂I₃.

ABSTRACT: Perovskite-inspired materials aim to replicate the optoelectronic performance of lead-halide perovskites, while eliminating issues with stability and toxicity. Chalcohalides of group IV/V elements have attracted attention due to enhanced stability provided by stronger metal-chalcogen bonds, alongside compositional flexibility and ns² lone pair cations - a performance-defining feature of halide perovskites. Following the experimental report of solution-grown tin-antimony sulfoiodide (Sn₂SbS₂I₃) solar cells, with power conversion efficiencies above 4%, we assess the structural and electronic properties of this emerging photovoltaic material. We find that the reported centrosymmetric Cmcm crystal structure represents an average over multiple

SUBMITTER: Kavanagh SR 

PROVIDER: S-EPMC8489399 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature