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Research Interests

3. Thermoelectrics:

Details

Thermoelectric (TE) materials are solid state devices that could be designed using two dissimilar materials such as n-and p-type semiconductors, connected electrically in series and thermally in parallel. Thermoelectric devices are double functional devices that can be used for power generation or refrigeration. They can be designed to convert thermal energy from a temperature gradient into electrical energy (Seebeck effect), where carriers diffuse from the hot to the cold side creating a voltage drop and a current flow. However, if a voltage drop is applied to the TE ends, a current flows from one end carrying heat to the other creating a temperature gradient (Peltier effect). Te-based alloys are known to have the highest figure-of-merit (ZT) value, which is a measure of TE performance. However, these materials are not very promising for functional applications due to their high costs, low natural abundance, instability at high temperatures, and toxicity. Therefore, oxides appear to be a better alternative as they are of low cost, more abundance and stable against decomposition at high temperatures, the fact that makes them more appropriate for applications, specially in power generation. In this branch of research, we calculate the transport properties (Seebeck coefficient, electrical and thermal conductivities) of tungsten bronze oxides to predict materials of high figure-of-merit.

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Created at 9/22/2015 4:40 AM by Bothina Hamad
Last modified at 9/22/2015 4:40 AM by Bothina Hamad