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- W1539448023 abstract "In summary, we have introduced the equations that describe the boundary impedances of a thermoelectric. These equations are quite general and apply to all kinds of boundaries. We have given examples of these impedances for the cases of tunneling and thermionic emission, and found that the electrical components obey a boundary form of the Wiedemann-Franz law. Estimation of the corresponding boundary Seebeck coefficients indicate that SB for thermionic emission can be as large as bulk Seebeck coefficients of good thermoelectric materials. However, we have shown that the boundary and bulk thermoelectric effects cannot be combined to enhance the effective Seebeck coefficient of a heterostructure or a superlattice. On the contrary, whenever there is a finite electronic thermal resistance at the junctions, the boundary effects reduce the effective Seebeck coefficient as the thickness of the semiconducting layers decreases. On the other hand, as expected, the presence of thermal boundary resistances at the interfaces causes reduction of the effective thermal conductivity. These two effects are combined in the effective figure of merit of the device, and, depending on values of the boundary impedances, may lead either to its enhancement or to its reduction. We have found that the maximum enhancement can be achieved for submicron thickness of the layers when the boundaries block the phonon heat flow more efficiently than the electronic heat flow and when the two subsystems are out of equilibrium. Electrical boundary resistances at the junctions degrade the performance of the device, but its influence on the effective figure of merit is not very important as long as ρB satisfies the boundary Wiedemann-Franz law. Finally, in solving the equations for the transport of heat through a device with a boundary at each end, we find a new type of thermal instability associated with the boundary. This instability should be present in short thermoelectric devices." @default.
- W1539448023 created "2016-06-24" @default.
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- W1539448023 date "2001-01-01" @default.
- W1539448023 modified "2023-10-17" @default.
- W1539448023 title "Chapter 8 Heat and electricity transport through interfaces" @default.
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- W1539448023 doi "https://doi.org/10.1016/s0080-8784(01)80142-3" @default.
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