Program Manager:
Dr Jeff McCallum- University of Melbourne

Participating UM Researchers:
A/Prof David Jamieson
A/Prof Steven Prawer
Dr Changyi Yang
Dr Chris Pakes
Mr Paul Spizzirri
Mr Matthew Lay

Collaborating Centre Researchers:
A/Prof Andrew Dzurak - University of New South Wales
A/Prof Michelle Simmons - University of New South Wales
A/Prof Alex Hamilton - University of New South Wales
Dr Linda Macks - University of New South Wales

Other Collaborators:
Prof C. Jagadish - Australian National University
Dr Sanju Deenapanray - Australian National University
Prof John Pilbrow - Monash University

Program Description:
The operating conditions of a silicon-based qauntum computer are expected to place stringent requirements on the quality of the material and the processes used to make it. The aim of the Materials Program is to investigate the materials properties of silicon utilised in making the device and the effect that each processing step has on these properties. The program commenced in 2001 with studies in two main areas:

• Characterisation of charge traps in silicon introduced via ion implantation.
  
• Electron paramagnetic resonance studies of phosphorus in ion implanted silicon.
  

Ion implantation is one of the principle processing techniques under investigation for forming an ordered array of phosphorus atoms. This technique introduces defect centres in silicon which act as charge traps. Charge traps are expected to be detrimental to operation of the device. These defect centres, their dependence on ion implantation and thermal annealing conditions are being quantified using Deep Level Transient Spectroscopy (DLTS). This study is expected to aid in identifying the range of processing conditions suitable for building a quantum computer.

Electron paramagnetic resonance studies of phosphorus implanted silicon allow spin-related defects to be identified and the local environment of the phosphorus atoms to be probed. This study is designed to ensure that the local environment of the phosphorus atoms is suitable for the spin operations of the quantum computer.

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