Abstract
In a high electric field, a population of electrons may be driven out of thermal equilibrium with the crystal lattice, hence becoming ‘hot’. In this chapter, the basic concepts of hot electron transport in semiconductors are introduced following a semiclassical approach. Scattering mechanisms pertinent to hot electron transport are described, including phonon, electron–electron and alloy scattering. The high-field phenomena of avalanche breakdown and negative differential resistance are discussed qualitatively in terms of the underlying physics and as a motivation for device applications. Techniques to solve the Boltzmann transport equation are then introduced. A low-field solution, including an introduction to the ladder method for dealing with polar optical phonon scattering, is first discussed as a foundation for the subsequent high-field solution.
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Acknowledgments
The author thanks Masoud Seifikar for useful discussions on the high-field solution of the Boltzmann equation. The author’s current position at the Tyndall National Institute is funded by the Science Foundation Ireland.
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Vaughan, M.P. (2012). Hot Electron Transport. In: Balkan, N., Xavier, M. (eds) Semiconductor Modeling Techniques. Springer Series in Materials Science, vol 159. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27512-8_4
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