Submitted on: 23 February 2000.
Revised on: 14 May 2000.
Accepted on: 03 July 2000.
___________________Journal of Semiconductors---IOP PUBLISHING LTD
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Submitted on: 10 April 2010.
Revised on: 05 August 2010.
Accepted on: 14 September 2010.
___________________Journal of Semiconductors---IOP PUBLISHING LTD
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