Abstract
Thermoelectric properties of Si and Ge nanowires are studied theoretically using sp <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> d <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sup> s* tight-binding and ballistic transport approach. We found that the Seebeck coefficient and power factor per area depend on the nanowire size and its orientation. In addition, for nano-scale nanowires, cross-sectional shape effect is considerable and transmission mode dominates the performance. Temperature also has a great impact on the thermoelectric performance of nanowires. The power factor of Si nanowires along different orientations is approaching to the same value as temperature growing higher than 300 K; while power factor of Ge nanowires along [100] is the largest at high temperature, but the smallest at extreme low temperature.
Published Version
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