Hydrogen passivation of Se and Te in AlSb.

Using infrared absorption spectroscopy we have observed local vibrational modes ~LVM’s! arising from DX-hydrogen complex in AlSb. Hydrogen was diffused into bulk AlSb:Se and AlSb:Te by annealing in sealed quartz ampoules with either hydrogen gas or methanol ~CH3OH!. The persistent photoabsorption of the DX-like Se donor is significantly reduced after hydrogenation. In hydrogenated AlSb:Se, we attribute the LVM peaks at 1608.6 and 1615.7 cm to hydrogen stretch modes. Deuterated AlSb:Se has only one stretch mode at 1173.4 cm. The second, third, and fourth harmonics of the wag modes are observed and show splittings consistent with C3v symmetry. In AlSb:Te, we find a hydrogen stretch mode at 1599.0 cm 21 and a deuterium mode at 1164.4 cm. We propose a model in which the hydrogen attaches to an aluminum in a @111# antibonding orientation. @S0163-1829~96!04824-2#