Vibrational Spectroscopy of Na-H Complexes in ZnO

Sodium acceptors were diffused into ZnO bulk single crystals to a depth of similar to 1 mu m, with a near-surface concentration of similar to 10(18)-cm(3). An O-H local vibrational mode (LVM) was observed at 3304-cm(-1), at a temperature of 9 K, in hydrogenated samples. The LVM is attributed to an O-H bond-stretching mode adjacent to a Na acceptor. When deuterium substitutes for hydrogen, a peak is observed at 2466-cm(-1). The isotopic frequency ratio is similar to values found in other hydrogen complexes. In the deuterated sample, a sideband at 2461-cm(-1) is attributed to a Fermi resonance.