Calculation of the electron initiated impact ionization transition rate in cubic and hexagonal phase ZnS
作者:
E. Bellotti,
K. F. Brennan,
R. Wang,
P. P. Ruden,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 82,
issue 6
页码: 2961-2964
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.366131
出版商: AIP
数据来源: AIP
摘要:
The wave-vector dependent, electron initiated, impact ionization transition rates for the cubic and hexagonal phases of ZnS have been numerically determined using a pseudopotential calculated band-structure and wave-vector dependent dielectric function. The rates for both phases show a strong dependence on the relative band structures. A detailed band-by-band analysis of the transition rate in the first Brillouin zone has been performed to determine the wave-vector dependence of the rate. The energy dependent rates have also been computed by averaging the transition rate over energy. It is found that the hexagonal phase of ZnS exhibits a higher ionization transition rate than the cubic phase. A preliminary estimation of the nature of the threshold has been made using a previously published phonon scattering rate. ©1997 American Institute of Physics.
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