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|Title:||Geometry effects on thermoelectric properties of silicon nanowires based on electronic band structures|
|Authors:||Liang, G. |
|Citation:||Liang, G., Huang, W., Koong, C.S., Wang, J.-S., Lan, J. (2010). Geometry effects on thermoelectric properties of silicon nanowires based on electronic band structures. Journal of Applied Physics 107 (1) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3273485|
|Abstract:||The thermoelectric properties of silicon nanowires with different shapes, sizes, and orientations are theoretically investigated using sp 3d5sßtight-binding model coupled with ballistic transport approach. We found that the thermoelectric properties significantly depend on nanowire geometry. Compared to  and  nanowires, n-doped and p-doped  nanowires show the worst performance in terms of power factor per cross-section area and figure of merit (ZT). As nanowire size decreases, thermoelectric properties of nanowires can be enhanced. As a result, triangular nanowires with side length of 1 nm have the best results of Z T and it can be enhanced to 1.5 and 0.85 for an n-type nanowire along  orientation and a p-type nanowire along  orientation, respectively. For extremely narrow nanowires, thermoelectric properties are only dependent on the number of the transmission modes instead of material properties such as carrier effective mass. Moreover, cross-section shape and thermal conductance contributed by electrons play important roles in ZT while their influence can be ignored for large size nanowires. Even though smaller size nanowires have better performance with the consideration of the single nanowire thermoelectric properties, they might be less efficient than larger diameter nanowires, as packing space is not very dense. © 2010 American Institute of Physics.|
|Source Title:||Journal of Applied Physics|
|Appears in Collections:||Staff Publications|
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