Annealing behavior of vacancies and the Z1/2 levels in n-type 4H–SiC epilayers after 2 MeV electron irradiation has been studied using positron annihilation and deep-level transient spectroscopy. Isochronal annealing studies indicate that silicon vacancy-related defects are primarily responsible for positron trapping. The Z1/2 levels are the predominant deep centers after irradiation and subsequent annealing at 1200 °C. Both the positron-trapping rate at vacancies and the Z1/2 concentration decrease in a similar manner while annealing from 1200 to 1500 °C. It is thus proposed that the Z1/2 levels originate from silicon vacancy-related defects. © 2001 American Institute of Physics.
Published in:
Applied Physics Letters
(Volume:79
,
Issue:
24
)
Date of Publication:
Dec 2001
- Page(s):
-
3950
-
3952
- ISSN :
-
0003-6951
- Digital Object Identifier :
-
10.1063/1.1426259
- Product Type:
-
Journals & Magazines
- Date of Current Version :
-
18 June 2009
- Issue Date :
-
Dec 2001