The structure and vibrational modes of H-CSUBAs/SUBpairs in passivated AlAs grown by chemical beam epitaxy

摘要

AlAs layers grown by chemical beam epitaxy (CBE) and doped with either12C or13C have been passivated with hydrogen or deuterium. Infrared absorption lines due to hydrogen stretch modes, symmetric A1, modes and 'carbon-like' E modes of H-CAsand D-CAspairs have been assigned for both carbon isotopes. Comparisons have been made with previous measurements made on H-CAscentres in GaAs:C and with simple harmonic models, and the results are shown to be in agreement with ab initio local density functional calculations.