Quasiclassical mobility for extrinsic semiconductors |
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Authors: | Richard L Liboff |
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Institution: | Schools of Electrical Engineering and Applied Physics, Cornell University, Ithaca, NY 14853, U.S.A. |
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Abstract: | A quasiclassical formulation for mobility in extrinsic semiconductors is presented based on scattering from ionized impurity atoms. Quantum theory enters the otherwise classical Chapman-Enskog expansion of the Boltzmann equation through incorporation of the Thomas-Fermi interaction potential together with the Bom approximation for evaluation of scattering integrals. The following expression results for mobility μi, (cgs): , , where ns is impurity concentration, m1 is effective mass, E1(γ) is the exponential integral, ? is dielectric constant and γ is dimensionless Thomas-Fermi energy. The structure of the dimensional factor in the preceding expression for μi agrees with previous expressions for this parameter. |
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Keywords: | mobility quasi-classical impurity atoms extrinsic semiconductor Chapman-Enskog expansion Thomas-Fermi interaction Bom approximation |
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