It was noted that as-grown material exhibited p-type conductivity. By using infra-red absorption spectroscopy, local vibrational modes were observed which arose from C impurities in n-type and p-type samples. The first and second harmonics of the 12C mode had frequencies of 591.6 and 1179.2/cm, respectively, at liquid-He temperatures. A peak at 572.9/cm was tentatively identified as being the 13C local vibrational mode. Complexes (C-H) were formed upon annealing p-type material in H; yielding a C-H stretching mode at 2566.6/cm. The results indicated that, during the growth of bulk AlSb, C contamination could be an important source of unintentional p-type doping.

Carbon Acceptors and Carbon-Hydrogen Complexes in AlSb. M.D.McCluskey, E.E.Haller, P.Becla: Physical Review B, 2002, 65[4], 045201 (4pp)