CARBON-RELATED PLATINUM DEFECTS IN SILICON - AN ELECTRON-PARAMAGNETIC-RESONANCE STUDY OF HIGH-SPIN STATES

In this article, we report about complexes in silicon investigated by electron paramagnetic resonance (EPR). In silicon doped with C and Pt we detected two different complexes: cr-1Pt (cr: carbon-related, 1Pt: one Pt atom) and cr-3Pt. The complexes have similar EPR properties. Th ey show a trigonal symmetry with effective g-values g(eff,perpendicula r to) = 2g(perpendicular to)approximate to 4 and g(eff,parallel to) =g (parallel to)approximate to 2 (g(perpendicular to), g(parallel to) tru e g-values). The g-values can be explained by a spin Hamiltonian with large fine-structure energy (electron spin S=3/2) and smaller Zeeman i nteraction. The participation of platinum in the complexes is proved b y the hyperfine interaction. From experiments with varying carbon conc entration we conclude that the complexes contain carbon. Atomistic mod els based on the Watkins vacancy-model for substitutional Pt were deve loped. (C) 1997 American Institute of Physics.