It rapidly increases at m = 2 and slowly increases from m = 3 to 5, indicating that clusters 3, 4, and 5 have almost insignificant differences in energy and are considered as they approach the saturation level.
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A DFT study of structural and electronic properties of copper indium ditelluride Cu <sub><i>m</i>-1</sub>In <sub><i>m</i></sub> Te<sub>2<i>m</i>-2</sub> with <i>m</i> = 2-5 neutral and anion clusters.
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