Abstract
We report on differences in photoluminescence (PL) spectra between Zn-polar and O-polar faces in single crystal ZnO. The PL intensity ratios of one phonon to two phonon replicas of free-excitons in the two polar faces were found to be the same. This result clearly indicates that exciton-phonon coupling strengths in both faces are the same. From moment analysis, however, the relative PL intensity of the zero-phonon free-excitons in the O-polar face was larger than that in the Zn-polar face. We propose that the opposite band bending at the two polar faces causes the difference in the PL properties.
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