Temperature and pressure dependence of the electronic and optical properties of GaxIn1−xAsyP1−y matching different substrates

Local pseudo-potential formalism under the virtual crystal approximation including the effective disorder potential was applied to study the electronic and optical properties of the quaternary GaxIn1−xAsyP1−y alloy lattice matched to GaAs, InP and ZnSe substrates. Results are presented for the energy gaps, ionicity, polarity, refractive index, high frequency and static dielectric constants of the considered alloy. The dependence of these properties on temperature and hydrostatic pressure for each matched substrate has been also studied. Comparison between the calculated energy band gaps and the available experimental and published data showed good agreement.