Effect of the energy of bombarding electrons on the conductivity of n-4H-SiC (CVD) epitaxial layers
- Authors: Kozlovski V.V.1, Lebedev A.A.2, Strel’chuk A.M.2, Davidovskaya K.S.2, Vasil’ev A.E.1, Makarenko L.F.3
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Affiliations:
- Peter the Great St. Petersburg State Polytechnic University
- Ioffe Physical–Technical Institute
- Belarusian State University
- Issue: Vol 51, No 3 (2017)
- Pages: 299-304
- Section: Electronic Properties of Semiconductors
- URL: https://journals.rcsi.science/1063-7826/article/view/199549
- DOI: https://doi.org/10.1134/S1063782617030137
- ID: 199549
Cite item
Abstract
The electrical characteristics of epitaxial layers of n-4H-SiC (CVD) irradiated with 0.9 and 3.5MeV electrons are studied. It is shown that the donor removal rate becomes nearly four times higher as the energy of impinging electrons increases by a factor of 4, although the formation cross section of primary radiation defects (Frenkel pairs in the carbon sublattice) responsible for conductivity compensation of the material is almost energy independent in this range. It is assumed that the reason for the observed differences is the influence exerted by primary knocked-out atoms. First, cascade processes start to manifest themselves with increasing energy of primary knocked-out atoms. Second, the average distance between genetically related Frenkel pairs grows, and, as a consequence, the fraction of defects that do not recombine under irradiation becomes larger. The recombination radius of Frenkel pairs in the carbon sublattice is estimated and the possible charge state of the recombining components is assessed.
About the authors
V. V. Kozlovski
Peter the Great St. Petersburg State Polytechnic University
Author for correspondence.
Email: kozlovski@physics.spbstu.ru
Russian Federation, St. Petersburg, 195251
A. A. Lebedev
Ioffe Physical–Technical Institute
Email: kozlovski@physics.spbstu.ru
Russian Federation, St. Petersburg, 194021
A. M. Strel’chuk
Ioffe Physical–Technical Institute
Email: kozlovski@physics.spbstu.ru
Russian Federation, St. Petersburg, 194021
K. S. Davidovskaya
Ioffe Physical–Technical Institute
Email: kozlovski@physics.spbstu.ru
Russian Federation, St. Petersburg, 194021
A. E. Vasil’ev
Peter the Great St. Petersburg State Polytechnic University
Email: kozlovski@physics.spbstu.ru
Russian Federation, St. Petersburg, 195251
L. F. Makarenko
Belarusian State University
Email: kozlovski@physics.spbstu.ru
Belarus, Minsk, 220030