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PL spectra due to 325 nm excitation of both polar faces of the ZnO single crystal. There is a small shift of in the peak luminescence between the two.
The 340 nm transient reflectivity for both the O face (a) and the Zn face (b). The convolution fit of the data is shown as the dashed red line on top of the measured reflectivity (black).
(a)–(c) are the three decay constants resulting from a best fit of the observed transient reflectivities as a function of carrier density. The squares and circles are the decay constants for the O and Zn face reflectivities, respectively.
Amplitudes of the Zn and O face incident reflectivity decay components.
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