Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 16: II-VI Semiconductors I
HL 16.5: Vortrag
Montag, 26. März 2012, 16:00–16:15, EW 202
A new model for the OTe-VCd complex in CdTe — •Dirk Bastin1, Edward Lavrov1, Jörg Weber1, Jürgen Schneider2, Alex Fauler2, and Michael Fiederle2 — 1Technische Universität Dresden, 01062 Dresden, Deutschland — 2Freiburger Materialforschungszentrum, 79104 Freiburg, Deutschland
CdTe single crystals treated in CdSO4 vapor at 850 ∘C are investigated by IR absorption. Two local vibrational modes (LVM) at 1096.8 (ν1) and 1108.4 cm−1 (ν2) appear in the sample as the result of the thermal treatment. The modes were previously identified by Chen et al. as vibrations of the OTe-VCd complex [G. Chen et al., Phys. Rev. Lett. 96, 035508 (2006)]. We detect in our samples additional LVMs with intensities which match the natural abundance of the sulfur isotopes. The reported dependence of the absorption intensities of ν1 and ν2 from the oxygen concentration of the samples points to a model of an sulfur-oxygen complex of the vibrating center. From the intensities of the IR absorption involving the 18O isotope, we conclude that two oxygen atoms contribute to the LVMs.