Interband optical properties in wide band gap group-III nitride quantum dots

Abstract

Size dependent emission properties and the interband optical transition energies in group-III nitride based quantum dots are investigated taking into account the geometrical confinement. Exciton binding energy and the optical transition energy in <TEX>$Ga_{0.9}In_{0.1}N$</TEX>/GaN and <TEX>$Al_{0.395}In_{0.605}N$</TEX>/AlN quantum dots are studied. The largest intersubband transition energies of electron and heavy hole with the consideration of geometrical confinement are brought out. The interband optical transition energies in the quantum dots are studied. The exciton oscillator strength as a function of dot radius in the quantum dots is computed. The interband optical absorption coefficients in GaInN/GaN and AlInN/AlN quantum dots, for the constant radius, are investigated. The result shows that the largest intersubband energy of 41% (10%) enhancement has been observed when the size of the dot radius is reduced from <TEX>$50{\AA}$</TEX> to <TEX>$25{\AA}$</TEX> of <TEX>$Ga_{0.9}In_{0.1}N$</TEX>/GaN (<TEX>$Al_{0.395}In_{0.605}N$</TEX>/AlN) quantum dot.