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Impurity Breakdown in Germanium at Low Lattice Temperatures
Author(s) -
Pramanik T. K.,
Bhattacharya D. P.
Publication year - 1987
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.2221410121
Subject(s) - impurity , germanium , electron , lattice (music) , electric field , ionization , atomic physics , materials science , kinetic energy , thermal , condensed matter physics , dispersion (optics) , chemistry , thermodynamics , physics , silicon , nuclear physics , ion , optics , organic chemistry , quantum mechanics , acoustics , metallurgy
The kinetic processes which take part in the phenomenon of impurity breakdown in n‐Ge are known to be the impact ionisation of the neutral donor atoms by the relatively energised free electrons and the thermal recombination of the latter. The electric field dependence of the coefficients of these processes, A I ( E ) and B T ( E ) is calculated numerically. The calculations are carried out in the approximations of an effective electron temperature and a parabolic law of dispersion. The impurity breakdown characteristics of the material are then investigated. When compared with other calculations and with the available experimental data, the results obtained here show a better agreement in some of the characteristics with the experimental observations. The anomalous type behaviour obtained here in respect of some other characteristic is also discussed.