Journal
JOURNAL OF APPLIED PHYSICS
Volume 104, Issue 11, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3032907
Keywords
-
Categories
Funding
- University of Alabama
- NSF Division of Materials Research
Ask authors/readers for more resources
Time-dependent photoinduced electron paramagnetic resonance measurements have been made on high purity semi- insulating 4H-SiC to develop a more complete understanding of the optical transitions of the positively charged carbon vacancy V-C(+). The single defect model originally proposed is given validity by demonstrating that the time dependence of the photoinduced changes in V-C(+) may be fitted by a first order kinetic process. In addition, the photon energy dependence of the optical cross sections for capture and emission of electrons from V-C(+) is extracted by incorporating both processes into one expression for charge transfer. The data are interpreted by considering the role of the electronic density of states as well as participation of phonons. Analysis assuming only phonon participation yields thermal and optical energies of 1.6 and 2.15 eV, respectively, for charge transitions between V-C(+) and one of the band edges. Charge transfer between V-C(+) and the opposite band edge is associated with a thermal and an optical energy of 1.9 and 2.45 eV, respectively. An upper limit for the Franck-Condon shift of 0.55 eV is extracted from the difference between the thermal and optical energies. c 2008 American Institute of Physics. [DOI: 10.1063/1.3032907]
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available