Photoreflectance spectra of a ZnO heteroepitaxial film on the nearly lattice-matched ScAlMgO[sub 4] (0001) substrate grown by laser molecular-beam epitaxy

Chichibu, S. F.; Tsukazaki, A.; Kawasaki, M.; Tamura, K.; Segawa, Y.; Sota, T.; Koinuma, H.
April 2002
Applied Physics Letters;4/22/2002, Vol. 80 Issue 16, p2860
Academic Journal
Photoreflectance spectra of a high-quality ZnO epilayer on the ScAlMgO[sub 4] (0001) substrate grown by laser molecular-beam epitaxy exhibited clear excitonic resonances due to three excitons associated with uppermost valence bands (A, B, and C excitons). The oscillator strengths of the B and C excitons are larger than that of the A exciton. Their broadening was interpreted to be due to the contribution by exciton–polaritons in terms of large longitudinal–transverse splitting of respective excitons. Dependence of the exciton energy on temperature was well fitted assuming the Bose–Einstein statistics giving the Einstein characteristic temperature Θ[sub E] of 380 K (33 meV). © 2002 American Institute of Physics.


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