Search

The field-effect mobility characteristics of a non-degenerate ensemble of a two dimensional electron gas for interaction with acoustic mode lattice vibrations in the Si-SiO2 MOS structure at the high surface electric fields are calculated here for the low and high temperature cases. The calculation takes due account of some features which are usually neglected. These include the effects of (i) the transverse component of the phonon wave vector, (ii) the realistic model of the infinite triangular potential well along the transverse direction, while applying the momentum conservation approximation, and (iii) the full form of the phonon distribution function at low temperatures. The results seem to be interesting in that they are significantly different from what follows from other theories that neglect the effects of the above features. Moreover, the agreement between the results which are obtained here with the experimental data seems to be significantly better. The scope for further refinement of the present theory has been discussed. [ABSTRACT FROM AUTHOR]

Presents information on a study which investigated the microstructure of alloy films using small-angle x-ray scattering, infrared-absorption spectroscopy and flotation density measurements. Methods; Results; Discussion.

Presents a study that examined the growth of device quality amorphous silicon germanide:hydrogen alloys with high deposition rate under helium dilution. Way to achieve a high-quality amorphous silicon-germanium alloy with a low band gap; Methods used to prepare the samples; Values of the midgap defect densities and Urbach energies of two types of samples at different bandgaps.

Presents a study which developed device quality a-silicon germanide: hydrogen alloy at low substrate temperature suitable for solar-cell fabrication using low flow rate of silane and germane and strong hydrogen dilution. Discussion on the optoelectronic properties of a-silicon germanide: hydrogen films; Correlation between optoelectronic properties and structural properties and midgap defect densities; Comparison of the quantum efficiencies of several Schottky barrier devices.

Presents a study that reported the improvement obtained in the properties of α-SiGe:H films deposited by the usual radio frequency glow discharge method using low deposition rate and high hydrogen dilution of source gases. Experimental details; Results of the study; Conclusions.

Presents a study that investigated the multi-scattering theoretic approach to the thermal expansion of inhomogeneous materials. Theory used in the study; Effective thermal expansion coefficient for composites; Results and discussion.

Presents information on a study which investigated how the results obtained from self-consistent T-matrix solution for monoclinic polycrystals compare with the results obtained from the computer-simulated velocity averaging scheme. Aspects of multiple-scattering theory; Discussion of the self-consistent solution for the effective elastic constants; Results and discussion.

Presents a study which calculated the effective elastic properties of polycrystalline substances and different type of composite materials in terms of the component elastic properties. Basic integral equation approach of the effective medium theory; Application; Results and discussion.

Presents a study which investigated the multiple scattering theoretical and computer simulated dynamic model approaches to effective elastic properties of randomly disordered composites. Effective-medium theory for composites having components of different symmetries; Velocity averaging procedure for monocomponent polycrystals; Results and discussion.

Presents a study which deduced a general expression for determining the effective elastic properties of noncubic polycrystals. Method of the study; Results and discussion; Conclusion.

Discusses a solution for the elastic properties of polycrystalline and perfectly disordered multiphase composites by using the T-matrix method under certain suitable approximations. Basic integral equation approach of the effective medium theory; Calculation for a binary composite; Recurrence relations for the independent effective elastic constants.

Presents a study that described the elastic properties of a computer-simulated polycrystalline aggregate of a single component. Development of a procedure involving sound velocities in component crystallites; Method of calculating the average of velocities in the corresponding single component; Comparison of results obtained from effective medium theory and velocity averaging procedure.

Deals with a study that detailed the development of highly photosensitive low band gap hydrogenated amorphous silicon films by plasma enhanced chemical vapor deposition. Way of achieving the low band gap of a-silicon:hydrogen films; Importance of low band gap amorphous silicon germanium alloy; Manner in which optical measurement was conducted; Analysis of the hydrogen bonding configuration.