Indium sulfide (In2S3), an n-type HI-VI semiconductor with a midband gap (E_g = 2.0-2.2 eV for bulk), is currently being explored for a wide range of applications, including solar cells and phosphors for color displays. Inorganic solar cells with In2S3 buffer layers were reported to have power conversion efficiencies of up to 16.4. Indium sulfide also represents a promising alternative to CdS and CdSe because it is elementally nontoxic and thermally stable, can have comparable quantum yields, and possesses a band gap in the same range as these important II-VI semiconductors.
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