Precise determination of deformation potentials in InGaN alloy material in semipolar and nonpolar InGaN quantum wells

Abstract

Deformation potentials of InGaN have been precisely determined in order to make a reliable prediction of optical gain characteristics in semipolar and nonpolar InGaN quantum wells (QWs) laser didoes (LDs). Since the optical polarization properties in semipolar and nonpolar InGaN QWs are very sensitive to the values of deformation potentials, all the reported data on the optical polarization properties have been theoretically analyzed based on the k · p perturbation theory in this study, and we have made a precise determination of the deformation potentials’ set. In addition, optical gain characteristics of InGaN QWs on GaN substrates with arbitrary substrate orientations have been theoretically calculated by using the determined deformation potentials’ set. It is found that low-angle semipolar substrate orientation (θ ∼ 45°) is very promising for low-cost and high-performance green LDs with cleaved-facet cavity mirrors.