Effects of Size Nonuniformity on the Optical Transitions in a set of Realistic In_xGa_(1-x)N/GaN Quantum Dots, having a Gaussian Distribution

摘要

The absorption spectra of semiconductor quantum dots (QDs) are expected to be a series of δ-function-like discrete lines due to the nature of the density of states. In a realistic Ⅲ-Ⅴ QD system, the absorption spectra is the superimposition of the contribution from each individual dot and the overall behavior is modeled by considering a Gaussian size distribution. In this paper, we study and present the dependence of the Gaussian nature of the absorption spectra of In_xGa_(1-x)N/GaN QD systems on the dot size distribution. The dots were approximated as elongated rectangular boxes having finite potentials at the boundaries. The optical transitions and absorption spectra of In_xGa_(1-x)N/GaN QDs that have a square base and the variation of the height is Gaussian, are computed and analyzed