File:III-V bandgap.png

Summary

Note:

This figure required a considerable amount of work to be generated and belongs to my thesis. If you want to have access to a higher quality version contact me.

Description:

Band gap E_g of the technologically important III-V binaries as a function of lattice parameter (in-plane lattice parameter in the case of WZ nitrides). Solid circles indicate a direct gap material while empty circles indicate an indirect gap. The curves show the band gap for some of the ternaries, where solid lines indicate direct gap and dashed lines indicate indirect gap. The data for the cubic III-Vs has been taken from Ref.^[1], except for ZB nitrides, which is from Ref.^[2]. The data for the WZ nitrides is from Wu's review paper.^[3] The band gap of the ZB ternaries has been calculated as the minimum of the gaps at Γ, X and L from the respective band gap bowing parameters provided in Refs.^[1][2], using a quadratic interpolation with bowing parameter. The variation of E_g with composition for the WZ nitride ternaries has been calculated using the same type of interpolation from the bowing parameters recommended by Wu.^[3] A linear interpolation (Végard's law) is assumed for the lattice parameters of the ternaries. All data is for the zero-temperature limit T = 0.

References