The influence of hydrostatic pressure (up to 0.4 GPa) on optical transitions of (Ga0.3In0.7)2Se3 in the long-wave end of the fundamental absorption edge is studied at 296 K. The application of higher pressure causes an increase of the indirect optical energy gap as well as a higher transparency in the near-edge region, the emergence of a step-like structure in the absorption spectrum due to the formation and decay of free excitons, and the increase of steepness parameter σ of the Urbach tail in the exponential region. All these changes are interpreted as a result of diminished disorder in the crystals.
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Kranjčec et al. (1993) studied this question.