Research Activities
Actively engaged in research since 1962
- Worked for the D. Phil degree on Transport Properties of Solids, with particular emphasis on the lattice transport in silicon-germanium alloys. The analysis took into account separate contributions from transverse and longitudinal phonon branches.
- Study of the thermal conduction in fine-grained silicon germanium
alloys and alloys based on lead chalcogenides and alloys of
bismuth telluride. The transport properties of these systems
were studied with reference to determining their suitability
as thermoelectric materials. Theoretical optimization of the
thermoelectric figure-of-merit for different temperature ranges.
- Recent work related to the study of the multivalley structure
of energy bands on the figure-of-merit and the effect of non-parabolic
nature of energy bands in small gap semiconductors. The effect
of minority carrier conduction and the bipolar thermal conduction
at high temperatures have also been investigated.
- Recent interest in thermal, electrical and thermoelectric properties of low-dimensional systems. Of particular interest has been the heat capacity in two-dimensional systems with Lorenz factor having a temperature dependence. Study of one-dimensional systems is related to Seebeck coefficient and electrical conductivity as a function of wire diameter, temperature and electron ( hole) concentration.