Metastable VO2 Complexes in Silicon: Experimental and Theoretical Modeling Studies
We report on a combined experimental and theoretical study of the metastable form of the vacancy-dioxygen defect in Si labeled VO∗ 2. Important new experimental observations are the detection of mixed local vibrational modes of VO∗ 2 in 16O,18O co-doped samples, the determination of the position of LVM bands for the negatively charged defect, and an assignment of an acceptor level at about Ec − 0.05 eV. Defect energetics, electrical levels and LVM frequencies of the VO∗ 2 complex are also investigated by ab-initio density-functional modeling.We find it to be a bistable defect which accounts well for the experimental data. The metastable form produces an acceptor state at 0.05 eV below Ec, and can be thought of as a VO defect perturbed by interstitial oxygen.
B. Pichaud, A. Claverie, D. Alquier, H. Richter and M. Kittler
L.I. Murin et al., "Metastable VO2 Complexes in Silicon: Experimental and Theoretical Modeling Studies", Solid State Phenomena, Vols. 108-109, pp. 223-228, 2005