The theoretical characteristics of space-charge-limited
currents in solids are reviewed, and a survey of
suitable dielectric materials and experimental space-charge-limited devices is presented.
The properties of the gold-silicon contact as used
in space-charge-limited devices were experimentally investigated.
It was found that the observed characteristics
could be explained on the basis...
Relaxor characteristic of the solid solution (1-x)BaTiO₃-(x)Bi(Zn₁/₂Ti₁/₂)O₃ (BTBZT) was investigated in this research. X-ray diffraction technique and Raman spectroscopy revealed the crystal structure of BT-BZT at various compositions. For compositions with x ≤ 0.08, the solid solutions exhibited clear tetragonal symmetry and transitioned to pseudo-cubic symmetry as the content of...
Dielectric ceramics designed for capacitor applications for use in extreme environments, such as high temperatures, high voltages, or high-pressure environments, are in great demand. Existing capacitor technology fails to perform within these extreme conditions or such environments. The development of new dielectric ceramic materials for high temperature capacitor applications is...
Metal-insulator-metal (MIM) tunnel devices have been proposed for high speed applications such as hot electron transistors, IR detectors, optical rectennas for IR energy harvesting, and backplanes for LCDs. The majority of these applications require highly asymmetric and non-linear current versus voltage (I-V) behavior at low applied voltages and ultra-high frequencies....
In this thesis the concept of inhomogeneous
dielectrics is demonstrated for various optical coating
applications. Compositionally-varying silicon oxynitride
(SiON) dielectric layers, with the refractive index
varying as a function of position, are grown by computer-controlled
plasma-enhanced chemical vapor deposition
(PECVD) using silane, nitrogen, and nitrous oxide reactant
gases. Compositionally graded...
Dielectric waveguides are becoming important for their numerous
applications in integrated optics. The study of dielectric waveguides by analytical
techniques is not sufficient for many variations in waveguide shape, anisotropy,
and inhomogeneity commonly encountered in waveguide materials. This work
studies the finite element method as an accurate tool for the...
Local field effects on the dielectric properties of solids have
been studied for three-dimensional and two-dimensional crystals by
using two kinds of dipole models: an atomic dipole model in which
dipoles coincide with atom sites and a bond dipole model in which
dipoles are placed along bond directions. Local fields...
This work is concerned with the modeling and analysis of lossy planar dielectric
optical waveguides. Loss mechanisms which affect propagation characteristics are
reviewed, and various representations of the propagation constant in the lossy case
are defined. Waveguide structures which are susceptable to absorption and/or to
leakage loss, in particular silicon-based...