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Theoretical and experimental investigations of zonecenter optical phonons in wurtzite AlxGa1-x N using pseudo unit cell model

M. A. ABID1,* , H. ABU HASSAN1, S. S. NG1

Affiliation

  1. Nano-Optoelectronics Research and Technology Laboratory, School of Physics, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia

Abstract

Pseudo unit cell (PUC) model was applied to investigate the phonons frequency, mode number, static dielectric constant and high frequency dielectric constant of AlxGa1-xN mixed crystals. The theoretical results were compared with experimental results obtained using Raman and Fourier transform infrared spectroscopy on samples with different mole fraction (0 ≤ x ≤ 1) grown on c-plane (0001) sapphire substrates. Theoretical results indicated that the AlxGa1-xN had only one-mode of vibration for A1(LO) and classified as two-mode behavior for small Al composition range in agreement with the experimental results which revealed a two-mode behavior for the E1(TO)..

Keywords

AlxGa1-xN, PUC, Phonon, Raman, FTIR, Pseudo unit cell (PUC) model.

Citation

M. A. ABID, H. ABU HASSAN, S. S. NG, Theoretical and experimental investigations of zonecenter optical phonons in wurtzite AlxGa1-x N using pseudo unit cell model, Optoelectronics and Advanced Materials - Rapid Communications, 4, 5, May 2010, pp.693-698 (2010).

Submitted at: April 6, 2010

Accepted at: May 20, 2010