Local vibrational modes which arose from DX-H complexes were studied by means of infra-red absorption spectroscopy. The H was diffused into bulk Se-doped or Te-doped material by annealing in sealed quartz ampoules which contained H gas or methanol. It was found that the persistent photo-absorption of the DX-like Se donor was significantly reduced by hydrogenation. In the case of hydrogenated Se-doped samples, local vibrational mode peaks at 1608.6 and 1615.7/cm were attributed to H stretch modes. Deuterated Se-doped material exhibited only one stretch mode, at 1173.4/cm. Second, third and fourth harmonics of the wag modes were observed, and exhibited splittings that were consistent with C3v symmetry. In the case of Te-doped samples, a H stretch mode was found at 1599.0/cm and a D mode was found at 1164.4/cm. A model was proposed in which the H attached itself to an Al atom in a [111] anti-bonding orientation.

M.D.McCluskey, E.E.Haller, W.Walukiewicz, P.Becla: Physical Review B, 1996, 53[24], 16297-301