Accurate impact ionization model which accounts for hot and cold carrier populations

Grasser, T.; Kosina, H.; Heitzinger, C.; Selberherr, S.
January 2002
Applied Physics Letters;1/28/2002, Vol. 80 Issue 4, p613
Academic Journal
Conventional macroscopic impact ionization models which use the average carrier energy as a main parameter can not accurately describe the phenomenon in modern miniaturized devices. Here, we present a model which is based on an analytic expression for the distribution function. In particular, the distribution function model accounts explicitly for a hot and a cold carrier population in the drain region of metal–oxide–semiconductor transistors. The parameters are determined by three-even moments obtained from a solution of a six-moments transport model. Together with a nonparabolic description of the density of states, accurate closed form macroscopic impact ionization models can be derived based on familiar microscopic descriptions. © 2002 American Institute of Physics.


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