New class of chiral metal-halide semiconductors with the highest distortion index and chiral-induced spin-selectivity
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Chiral Pb-free metal-halide semiconductors (MHSs) have garnered significant interest in spintronics due to their unique spin-related properties, such as chiral-induced spin selectivity (CISS). Despite their excellent chemical and structural tunability, the range of materials and metal-halide structures exhibiting the CISS effect in Pb-free chiral MHSs is still limited. Here, we introduce palladium (Pd)-based chiral MHSs that exhibit 1D square-pyramid or 0D square-plane structures with a general formula ((R/S-MBA)2PdBr4)1–x((R/S-MBA)2PdCl4)x, x = 0, 0.25, 0.5, and 0.75. The 1D helical chains of Pd-halide square-pyramids display a distortion index of 0.128, which is the highest value among previously reported chiral MHSs and exhibit a CISS effect in polycrystalline bulk films. Acknowledgement This research was supported by the Digital Research Innovation Institution Program Through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (RS-2023-00283597)