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Structure-sensitive spectroscopy of transition-metal-hydrogen complexes in silicon.

Transition-metal-hydrogen complexes have been introduced into bulk Si samples that contained Pt, Au, or Rh by the indiffusion of hydrogen at 1250°C from H 2 gas. The structure and electrical properties of a PtH 2 complex in Si have been studied by vibrational spectroscopy and electron paramagnetic resonance (EPR). The PtH 2 complex has been found to introduce two levels in the Si bandgap. There is one paramagnetic charge state for which EPR provides detailed structural information and two nonparamagnetic charge states. The hydrogen vibrations of all three charge states of PtH 2 have been assigned. In addition to the PtH 2 complex, the hydrogen vibrations of several additional complexes in Si samples that contain hydrogen and Pt, Au, or Rh have been identified.