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Monte Carlo Calculations on Electron Transport in CdTe
Author(s) -
Borsari V.,
Jacoboni C.
Publication year - 1972
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220540229
Subject(s) - electron , scattering , monte carlo method , ionization , drift velocity , atomic physics , impurity , ionized impurity scattering , population , physics , electron mobility , electron scattering , mean free path , condensed matter physics , ion , nuclear physics , optics , quantum mechanics , statistics , demography , mathematics , sociology
Abstract A theoretical analysis of high‐field electron transport in CdTe has been performed with the Monte Carlo technique for different temperatures and ionized impurity contents. The negative differential mobility is due to the combined effect of the increasing population of the low‐mobility satellite valleys and of the intervalley scattering on the mobility of the electrons in the central valley. Which of the above mechanisms is predominant depends on the particular values of physical parameters which, in the case of CdTe, are not yet well known. Ionized impurity scattering maintains its influence on the electron drift velocity also at very high applied fields, above the threshold value (around 10.5 kV/cm at 77 °K). At these fields the electron mean energy is very high. and one would expect the effect of such scattering to be negligible. This feature must not be attributed to an effect of the ionized impurities on very fast electrons but rather to the larger number of electrons that ionized impurity scattering keeps in the more randomized low energy part of the distribution function. The present theoretical results are discussed and compared with recent experimental data.