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Carrier Scattering at High Electric Fields

  • Karl W. Böer
  • Udo W. PohlEmail author
Living reference work entry

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Abstract

At high electric fields the scattering of carriers is significantly influenced by carrier heating. Usually scattering is increased and counteracts an enhanced accumulation of carrier energy from the field. Such an increased scattering is observed for interaction with phonons, causing a decrease in mobility: first mostly from acoustical scattering and at higher fields from LO-phonon scattering. The drift velocity is thereby limited to values close to the thermal carrier velocity. The deformed carrier distribution can be approximated by a Boltzmann distribution, assuming a carrier temperature elevated above the lattice temperature. Above the energy of longitudinal optical phonons the distribution is skewed substantially, and a description of the distribution function and carrier mobility by a Fourier series is more appropriate. Also numerical solutions of transport problems are then advantageous.

Keywords

Carrier distribution Carrier heating Diffusion-current saturation Drift-velocity saturation Electron temperature Hot electrons Intervalley scattering Intravalley scattering Lattice temperature Saturation velocity Warm electrons 

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Copyright information

© Springer International Publishing AG 2020

Authors and Affiliations

  1. 1.NaplesUSA
  2. 2.Institut für Festkörperphysik, EW5-1Technische Universität BerlinBerlinGermany

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