Electron transport in systems of reduced dimensionality

Preview

PDF WRAP_Theses_Milsom_1987.pdf - Submitted Version - Requires a PDF viewer. Download (6MB) | Preview

Request Changes to record.

Abstract

The Boltzmann equation is modified to examine the effects of a range of scattering mechanisms on the DC conductivity of semiconductor material in the form of thin sheets and fine wires.

This is solved exactly for elastic scattering mechanisms by introducing a set of momentum relaxation times which are relevant to the occupied sub-bands. These times are calculated for alloy scattering, surface roughness scattering and the acoustic phonon mechanisms at high temperatures.

At low temperatures the inelasticity of the acoustic phonon mechanisms is taken into account and a variational method is employed. At very low temperatures we show that the acoustic deformation potential gives rise to a mobility which varies at T-5.

We use an iterative method to examine the strongly inelastic polar optic phonon scattering mechanism in a wire. Ridley has suggested that the momentum relaxation time may be negative in this system. We introduce a time relevant to transport measurements and this is found to be positive. It is shown that the time derived by Ridley may be of relevance to time resolved transport measurements.

Request changes or add full text files to a record

Repository staff actions (login required)

View Item