A theoretical study of some transport processes in semiconductors

Boardman, AD

Abstract

The problems discussed range from the scattering of electrons by
impurity potentials to the propagation of electromagnetic waves in a
non-active plasma.
In particular the theory of dipole scattering in semiconductors is
considered in some detail. The earlier part of text contains a discussion
of the validity of the usual Brooks-Herring approximation to the electron
potential energy. The conclusion, that the latter approximation can be
quite poor for some values of the parameters of the problem is more clearly
demonstrated than in any previous formulations.
Ilany-valley dipole scattering is discussed and it is shown that the
maximum anisotropy parameter at high electron energies is less than the
corresponding value for point-ions.
The foregoing work is then followed up by a general partial-wave theory
of elastic scattering, by non-spherically-syiametric potentials. These
techniques are subsequently applied to the problem of aligned cylindrically
(dipole) symmetric potentials.
Finally, the emphasis changes and the problem of helicon propagation
in a non-active plasma is solved. The helicons are allowed to propagate
in a metal-semiconductor sandwich structure and, as anticipated, it is shown
that the familiar parabolic frequency-wave-number relationship breaks up into
bands of allowed and forbidden frequency ranges.

Citation

Boardman, A. A theoretical study of some transport processes in semiconductors. (Thesis). University of Salford

• Thesis Type: Thesis
• Deposit Date: Jun 29, 2021
• Award Date: May 1, 1968