NNSE618-L13-scattering_mechanisms

NNSE618-L13-scattering_mechanisms - 1 Lecture contents...

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NNSE618 Lecture #13 1 Lecture contents Other scattering mechanisms Piezoelectric Optical non-polar phonons Optical polar phonons Ionized impurities Neutral impurities Alloy
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NNSE618 Lecture #13 2 Compound semiconductors with lack of inversion symmetry Interaction through polarization [electromechanical tensor times strain tensor]: Acoustic phonon scattering: almost elastic Interaction increases at low q -vectors (due to electrostatic interaction: Scattering time: Mobility will be affected by phonon density: Scattering mechanisms: Piezoelectric scattering From Balkanski and Wallis, 2003 2 1 E k 2 1 ) ( kT   ˆ ˆ 4 4 m pz pz e P q e H pz pz
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Lecture #13 3 Continuity equation without sources: Poisson equation (field divergence due to uncompensated charges) Debye or dielectric relaxation time: Debye screening length (diffusion during D ) Range of long wavelengths of phonons which scatter carriers is determined by Debye screening length L D Debye screening length n t n  4 0 1 e t n n e 4   D t e t n n / 0 en D 4 n e kT D L D D using
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This note was uploaded on 11/07/2011 for the course NNSE 618 taught by Professor Sergeoktyabrsky during the Spring '11 term at SUNY Albany.

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NNSE618-L13-scattering_mechanisms - 1 Lecture contents...

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