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- W2530510440 abstract "We study nonlinear transport effects on the maximum efficiency and power of thermoelectric devices. Using a QD inelastic thermoelectric device, we show that the maximum power at given temperature difference can be significantly increased to more than four times as large as that estimated from the linear transport coefficients. As a consequence, the maximum efficiency is also increased from 16% to 25% of the Carnot efficiency, despite considerable increase of the parasitic heat current in the nonlinear transport regime (as modeled by a step function transmission of phonons). Such improvements are associated with the significant increases of the short-circuit current and the open-circuit voltage. As a comparison, we also studied a QD elastic tunneling thermoelectric device, where we found that the maximum efficiency is rather reduced by the nonlinear transport effects. The distinction between the inelastic and the elastic devices is found to originate from the Bose distribution factor in the inelastic transport that greatly enhances charge current at large temperature differences. That is, the electrical current in the inelastic thermoelectric device is controlled by the phonon flux absorbed by electrons. A large flux density of absorbed phonons leads to great enhancement of the electrical current, the output power and the energy efficiency. Our study sheds more light on understanding the differences between conventional thermoelectric devices and solar cells, as well as the similarities between the inelastic thermoelectric devices and solar cells." @default.
- W2530510440 created "2016-10-21" @default.
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- W2530510440 date "2016-10-10" @default.
- W2530510440 modified "2023-09-25" @default.
- W2530510440 title "Enhancing thermoelectric efficiency and power using nonlinear inelastic transport" @default.
- W2530510440 hasPublicationYear "2016" @default.
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