Abstract
Low temperature environment friendly solution processing of metal chalcogenide absorbers is highly desired for low-cost and scalable fabrication of thin-film solar cells. However, the incorporation of selenium (Se) into sulfo-selenide absorber films previously reported devices has required the use of harmful solvents in the precursor solution and/or a high-temperature selenization compatible with the substrate type configuration. In this study, we address these issues by introducing a novel, less toxic thiol-amine-based solvent system designed for the direct incorporation of Se. This approach enables the synthesis of sulfo-selenide absorbers at significantly lower temperatures as demonstrated by the successful fabrication of a selenization free CZTSSe absorber layer within a superstrate-type thin-film solar cell for the first time. Our method not only reduces the environmental footprint of the fabrication process but also has the potential for offering the scalability and cost-effectiveness in producing chalcogenide thin films for energy device applications.
Published Version
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