Abstract
From the analysis of the variation of the energy gap with temperature and pressure in some ${A}^{\mathrm{I}{B}^{\mathrm{III}{C}_{2}^{\mathrm{VI}}}}$ chalcopyrite compounds, valence- and conduction-band acoustic deformation potentials are calculated. It is found that both the valence- and conduction-band extrema move to higher energies on compression in these compounds. This should explain the small band-gap pressure and temperature coefficients observed in ${A}^{\mathrm{I}{B}^{\mathrm{III}}}$${C}_{2}^{\mathrm{VI}}$ chalcopyrite compounds relative to their binary analogs.
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