Vibrational Spectroscopy of Na–H Complexes in ZnO

Abstract

Sodium acceptors were diffused into ZnO bulk single crystals to a depth of ~1μm, with a near-surface concentration of ~1018–cm3. 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.