In LEC-grown InP, about 30 sharp vibrational absorption lines were measured in the frequency region 2200 to 2350/cm. All these lines were due to P-H stretching modes. Experiments on InP containing both H and D finally proved that the line at 2202.4/cm was due to a single H atom bonded to P in an In vacancy (VIn) and that the line at 2315.6/cm was due to the complex of four P-H bonds in an VIn. In the case of InP:H:D, this VInH4 complex gave rise to 6 vibrational lines in the region of P-H modes and 6 lines in the region of P-D modes because of the 5 different types of VInHnDm complexes. The measured frequencies of these 12 lines were in excellent agreement with those obtained from ab initio calculations reported in the literature.

Phosphorus-Hydrogen Complexes in LEC-Grown InP. W.Ulrici, A.Kwasniewski, M.Czupalla, M.Neubert: Physica Status Solidi B, 2005, 242[4], 873-80