Presentation
Charge Transport in Disordered Materials and the Dispersion Parameter
Utah State University Physics Colloquium
(2019)
Abstract
Charge transport in disordered solids can be described with use of a
dispersion parameter. The dispersion parameter can be defined simply as
either the thermal energy (low electric field regime) or the field energy (high
field regime) scaled by the reciprocal of a characteristic energy of the
material. A transitionary temperature and electric field are defined when the
ratio of thermal or field energy over the characteristic energy is one,
respectively. This indicates a transition from dispersive transport to normal
transport. Dispersive transport can be described simply by the dispersion
parameter for many disordered materials. Models involving the dispersion
parameter describe anomalous behavior for disordered materials in
measurements of charge transport for photoconductivity, DC conductivity,
radiation induced conductivity, permittivity, and electrostatic breakdown
onset, among others. Dispersive to normal transport transitions have been
measured with pulsed electroacoustic measurements of internal charge
distributions for high field induced transitions. Temperature induced
transitions have been measured in photoconductivity and DC conductivity
experiments. Low-density polyethylene (LDPE) is a ubiquitous disordered
polymer and will be used as an example to show the connections between
various measurements through the dispersion parameter. Our group is in
the process of measuring temperature dependent conductivity for LDPE
with the constant voltage conductivity method.
Disciplines
Publication Date
October, 2019
Location
Utah State University, Logan, UT
Citation Information
Zachary Gibson. "Charge Transport in Disordered Materials and the Dispersion Parameter" Utah State University Physics Colloquium (2019) Available at: http://works.bepress.com/zachary-gibson/33/