chichibu-jjap-36-1976

Data for reference chichibu-jjap-36-1976

Exciton Spectra of Cubic and Hexagonal GaN Epitaxial Films

S Chichibu, H Okumura, S Nakamura, G Feuillet, T Azuhata, T Sota, S Yoshida

Japanese Journal of Applied Physics 36(3B), 1976 (1997).

Fundamental exciton structures in both cubic (c) and hexagonal (h) polytypes of GaN epitaxial films were compared. The photoreflectance (PR) spectra of both polytypes exhibited excitonic transitions up to room temperature (RT). The lowest exciton resonance energy of c-GaN (3.267eV at 10K) was confirmed to be smaller by 0.21eV than that of h-GaN. The low-temperature photoluminescence (PL) spectra of both polytypes were dominated by excitonic emissions; h-GaN exhibited well-resolved bound and free exciton peaks and c-GaN exhibited a broadened excitonic emission, which was dominated by bound and free excitons below and above 80K, respectively. The PL spectra at RT of h-GaN exhibited predominant A and B free exciton emissions. The E2 phonon replicas of excitons were found in the PL spectra of h-GaN, indicating the coupling of excitons with nonpolar phonons through the deformation potential.

Contributed by A.E. Nikolaev from www-proxy.ioffe.rssi.ru. on Friday, June 20, 1997 3:15:34 PM

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