Optical properties of the(CuInSe2)1−x−(2ZnSe)xsystem
作者： J. N. Gan , J. Tauc , V. G. Lambrecht , M. Robbins
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摘要: Optical electronic transitions were studied in the ${(\mathrm{CuIn}{\mathrm{Se}}_{2})}_{1\ensuremath{-}x}\ensuremath{-}{(2\mathrm{ZnSe})}_{x}$ system from 0.5 to 14 eV. The crystallizes chalcopyrite structure for $x\ensuremath{\le}0.43$ and zinc-blende $x\ensuremath{\ge}0.48$. absorption edge was found be direct all compositions energy gap varies with $x$ parabolically, without discontinuity at structural transition. This dependence is associated substitutional disorder mixtures. Reflection measurements showed substantial differences between those structure. additional peaks observed compounds are ascribed pseudodirect which become allowed by zone folding. optical constants visible ultraviolet regions determined reflection spectra Kramers-Kronig analysis. of bands on composition discussed possible assignments suggested. effective number electrons per atom contributing, range studied, calculated depend strongly amount Cu $d$ mixture as well crystal
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