科研之友
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摘要
Nonpolar a-plane ZnO films were deposited for the first time on nearly lattice-matched a-plane GaN templates using an in situ SiNx interlayer by the pulsed laser deposition method. The symmetric and asymmetric reciprocal space mappings reveal the broadening effects of the reciprocal lattice points and the residual biaxial in-plane tensile strain of a-plane ZnO to be 0.335% and 0.055% along the [0 0 0 1] c-axis and [1 (1) over bar 0 0] p-axis, respectively. The photoluminescence spectrum at 85K is dominated by neutral donor-bound excitons and free-electron-to-bound (e-A(0)) emissions; relatively intense LO-phonon replicas of (e-A(0)) have also been observed in a-plane ZnO. Temperature-dependent PL spectra have also been discussed to identify the origin of the emission peaks. Up to fourth A(1)(LO) phonon mode can be observed to be enhanced significantly from the resonant Raman spectrum.
