Abstract
The band-gap energy of II-VI compound semiconductors was simply calculated using a modified dielectric theory. The calculated band-gap energies of MgS and MgSe were 4.62 and 3.67 eV. From the extrapolation of the band-gap energies of and the band-gap energies of MgSe and MgS of zinc blende at room temperature were determined to be 3.59 and almost the same as the value calculated using the modified dielectric theory. The bowing parameter of the ternary alloy was experimentally obtained as 0 eV, which can be explained in terms of the modified dielectric theory. The lattice constant of the quaternary alloy can be expressed by Vegard’s law [Z. Phys. 5, 17 (1921)]. The band-gap energy of can be expressed by the parabolic function of the composition considering the bowing parameter, where we use of 4.65, 3.59, 3.68, and 2.69 eV as the band-gap energies of MgS, MgSe, ZnS, and ZnSe, respectively.
- Received 29 September 1997
DOI:https://doi.org/10.1103/PhysRevB.57.2257
©1998 American Physical Society