Acoustic deformation potentials inAIBIIIC2VIchalcopyrite semiconductors

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.