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Compositional Engineering of Antimony Chalcoiodides Via a Two-Step Solution Process for Solar Cell Applications

ACS Applied Energy Materials(2021)

Daegu Gyeongbuk Inst Sci & Technol DGIST

Cited 12|Views4
Abstract
Antimony chalcoiodide, Sb(S,Se)I, has recently gained considerable attention as an alternative to Pb-based perovskites in next-generation solar cells. In this work, we propose an effective solution-processing method for fabricating Sb(S,Se)I alloy films with various S/Se ratios for solar cell applications. The proposed method involves two steps: the formation of Sb-2(S,Se)(3) (step I) and its conversion to Sb(S,Se)I (step II). We introduced an additional deposition step based on a SbCI3-selenourea solution in step I to fabricate Sb(S,Se)I alloy with tunable properties. We controlled the growth of Sb(S1-xSe)I films (0 <= x <= 1) and investigated the effects of the S/Se molar ratio on the bandgap, crystalline phase, morphology, and electronic structure. Further, based on the results, we propose suitable electron- and hole-transporting layers for constructing antimony chalcoiodide solar cells. This study highlights the potential of Sb(S,Se)I as a solar absorber and provides some clues to construct Sb(S,Se)I solar cells.
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Key words
antimony chalcoiodide,lead-free solar cells,two-step method,solution process,compositional engineering,SbSI,SbSeI
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