Journal
APPLIED PHYSICS LETTERS
Volume 76, Issue 24, Pages 3549-3551Publisher
AMER INST PHYSICS
DOI: 10.1063/1.126703
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Optical properties in undoped-ZnO epilayers grown by the laser-molecular-beam epitaxy method on lattice-matched ScAlMgO4 substrates were investigated. The absorption spectrum at 5 K has two sharp peaks, both of which are attributed to resonances of A and B excitons, which reflect a small nonradiative damping constant of excitons as well as high film crystallinity accomplished by the virtue of lattice matching. The coupling strengths of exciton-acoustic phonon and of exciton-longitudinal-optical phonon were directly determined from the temperature dependence of exciton absorption spectra independently for A and B excitons, which are close in energy and obey the same selection rule for each other. (C) 2000 American Institute of Physics. [S0003-6951(00)02924-7].
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