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In this study, all-inorganic copper halide salt K 2 Cu 2 Cl 6 single-crystal and thin films were prepared. The single-crystal diffraction data belonged to the monoclinic K 2 Cu 2 Cl 6 (space group = P  2 (1)/ C , unit cell parameters of a = 4.0340 Å, b = 13.7987 Å, c = 8.7445 Å, α = 90.000, β = 97.123, and γ = 90.000). As far as we know, this is the first study of the copper halide salt K 2 Cu 2 Cl 6 for optoelectronic applications. The band gap of K 2 Cu 2 Cl 6 is calculated to be approximately 1.85 eV. A low-cost photodetector based on the K 2 Cu 2 Cl 6 thin film was efficient under different monochromatic light from 330 to 390 nm with different chopping frequencies (1.33-30 Hz). Density functional theory (DFT) computational results indicate that the valence bands (VBs) and conduction bands (CBs) are shifted up in energy using the orbital-dependent correction to the DFT energy. Partial density of states reveals that the VBs and narrow CBs are derived from the hybrid orbitals of Cu 2+ 3d and Cl - p, respectively.

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Synthesis, Crystal Structure, UV–Vis Adsorption Properties, Photoelectric Behavior, and DFT Computational Study of All-Inorganic and Lead-Free Copper Halide Salt K2Cu2Cl6