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Exciton spectra of ZnO epitaxial layers on lattice-matched substrates grown with laser-molecular-beam epitaxy

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8 Author(s)
Makino, T. ; Photodynamics Research Center, The Institute of Physical and Chemical Research (RIKEN), Sendai 980-0868, Japan ; Chia, C.H. ; Tuan, N.T. ; Segawa, Y.
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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. © 2000 American Institute of Physics.

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Applied Physics Letters  (Volume:76 ,  Issue: 24 )