Electron spin resonance of platinum pair complex in silicon

We investigated a Pt-Pt pair in Si by electron spin resonance (ESR) measurement. Two kinds of ESR spectra from Pt-Pt pairs which had been already reported were not detected. However, we observed other ESR spectrum of Pt-Pt pair. The ESR spectrum showed the hyperfine structure corresponding to two equivalent Pt atoms. The anisotropic g-tensor obtained by analyzing the angular dependence of the ESR signals indicated the orthorhombic (C-2 nu) symmetry with the g-values of g(x) = 2.11, g(y), = 2.3 1, g(z) = 2.09. The g(z) axis was along [001] direction. The g(y) and g(z) axes were along [110] and [1 (1) over bar0] directions, respectively. The ESR spectrum of Pt-Pt pair was observed in the sample only tinder illumination. This Suggests that a change in the charge state of Pt-Pt pair is caused by carrier excitation. (c) 2005 Elsevier B.V. All rights reserved.