Optical properties of InGaN layers

ORAL

Abstract

Optical absorption spectroscopy provides important properties of a material including fundamental absorption edge and defect structures. We use it to investigate the band gap of In$_{x}$Ga$_{(1-x)}$N with different Gallium contents grown by HPCVD. The results have shown that a bowing parameter of b = 2.5 eV allows one to reconcile our results and the literature data for the band gap of In$_{x}$Ga$_{(1-x)}$N alloys over the whole composition range. In addition, we calculate the thicknesses of the In$_{x}$Ga$_{(1-x)}$N thin films through simulation of the transmission using a multilayer stack model. The free electron concentration in the In$_{x}$Ga$_{(1-x)}$N thin film determined here is also found to be in good agreement with that obtained from simulations of infrared reflection measurements we carried out.

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Authors

  • Jielei Wang

    Physics \& Astronomy Department, Georgia State University, Atlanta, GA 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA, 30303

  • Mustafa Alevli

    Department of Physics \& Astronomy, Georgia State University, Atlanta, GA, 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA, 30303

  • Ramazan Atalay

    Physics \& Astronomy Department, Georgia State University, Atlanta, GA 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA, 30303

  • Goksel Durkaya

    Department of Physics \& Astronomy, Georgia State University, Atlanta, GA, 30303, Department of Physics and Astrronomy, Georgia State University, Atlanta GA. 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA, 30303

  • Max Buegler

    Physics \& Astronomy Department, Georgia State University, Atlanta, GA 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA, 30303

  • Indika Senevirathna

    Physics \& Astronomy Department, Georgia State University, Atlanta, GA 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA, 30303

  • Nikolaus Dietz

    Georgia State University, Atlanta, Department of Physics \& Astronomy, Georgia State University, Atlanta, GA, 30303, Georgia State University, Department of Physics and Astrronomy, Georgia State University, Atlanta GA. 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA 30303, Physics \& Astronomy Department, Georgia State University, Atlanta, GA, 30303