Compounds that have low electrical conductivity, which increases with increasing temperature, and crystal structures related to that of cubic or hexagonal diamond are called diamond-like semiconductors (DLS). Many DLSs have optimal nonlinear optical (NLO) properties. For example, due to their noncentrosymmetric structures and moderate bandgaps, they may exhibit sizable second harmonic generation responses. Little information has been published on the structure and characterization of DLSs with the general formula I4-II-IV2-VI7. Using high-temperature, solid-state synthesis, samples of I2-II-IV-VI4 and I4-II-IV2-VI7 were prepared and assessed for phase purity by X-ray powder diffraction. Using single crystal X-ray diffraction, scanning electron microscopy equipped with energy dispersive spectroscopy, and diffuse reflectance UV/VIS/NIR the samples were further characterized.

High temperature, solid-state synthesis of copper-containing diamond-like semiconductor sulfides with potential nonlinear optical applications

ACS Spring 2022

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