Electron and hole trapping in thermal oxides that have been ion implanted
Photo-assisted charge injection techniques in conjunction with capacitancevoltage measurements have been used to study electron and hole trapping in thermal oxides implanted with up to 11016 cm?2 Si or Ar. Defects having large cross sections for electron trapping and photoionization are found in oxides implanted with large doses of Si, but not of Ar, suggesting the formation of Si clusters. It is also found that the magnitude of the shift in the flatband voltage, ?Vfb, resulting from hole trapping is increased in oxides implanted with up to 11015 cm?2 Si or Ar. In oxides implanted with higher doses of Si, however, ?Vfb is decreased. An explanation is proposed involving trapping of radiolytic hydrogen at Si clusters.
hole traps electron traps silicon nanocrystals ion implanted sio2