ArticleThe journal of physical chemistry letters2026
Stoichiometry-Induced Band Gap Opening in Epitaxial Degenerate Copper Sulfide Thin Films.
Article in The journal of physical chemistry letters, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Controlling the crystal phase and electronic structure of copper sulfide remains challenging due to its narrow stability window and sensitivity to sulfur stoichiometry, limiting reproducible optoelectronic performance. Here we report a low-temperature sulfur adsorption-corrosion strategy that converts 12-15 nm evaporated Cu into continuous copper sulfide thin films with tunable composition and electronic structure. Increasing the sulfurization time (10-60 s) reduces the Cu/S ratio from 2.4 to 1.2 and induces a phase transition from orthorhombic chalcocite-like Cu
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