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Akademický článek
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Materials capable of highly efficient, direct thermal-to-electric energy conversion would have substantial economic potential. Theory predicts that thermoelectric efficiencies approaching the Carnot limit can be achieved at low temperatures in one-di
Externí odkaz:
http://arxiv.org/abs/cond-mat/0601110
Advances in solid-state device design now allow the spectrum of transmitted electrons in thermionic and thermoelectric devices to be engineered in ways that were not previously possible. Here we show that the shape of the electron energy spectrum in
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506388
Autor:
Humphrey, T. E., O'Dwyer, M. F.
Publikováno v:
J. Appl. Phys. Vol. 98 pg. 026108 (2005)
It is shown that equations for electrical current in solid-state thermionic and thermoelectric devices converge for devices with a width equal to the mean free path of electrons, yielding a common expression for intensive electronic efficiency in the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502078
Autor:
Humphrey, T. E., Linke, H.
Publikováno v:
Phys. Rev. Lett. Vol. 94 pg. 096601 (2005)
Irreversible effects in thermoelectric materials limit their efficiency and economy for applications in power generation and refrigeration. While electron transport is unavoidably irreversible in bulk materials, here we derive conditions under which
Externí odkaz:
http://arxiv.org/abs/cond-mat/0407509
Autor:
Humphrey, T. E., Linke, H.
Publikováno v:
Physica E, Vol. 29 pg 390 (2005)
Differences between the thermodynamic behavior of the three-level amplifier (a quantum heat engine based on a thermally pumped laser) and the classical Carnot cycle are usually attributed to the essentially quantum or discrete nature of the former. H
Externí odkaz:
http://arxiv.org/abs/cond-mat/0407508
Autor:
Humphrey, T. E., Linke, H.
Inhomogeneously doped thermoelectric nanomaterials with a delta-function electronic density of states can operate with Carnot efficiency in the absence of phonon heat leaks. Here we self-consistently calculate the efficiency and power from open-circu
Externí odkaz:
http://arxiv.org/abs/cond-mat/0407506
Autor:
Humphrey, T. E., Linke, H.
Publikováno v:
J. Phys. D, Vol. 38 pg. 2051 (2005)
Conventional thermionic power generators and refrigerators utilize a barrier in the direction of transport to selectively transmit high-energy electrons. Here we show that the energy spectrum of electrons transmitted in this way is not optimal, and w
Externí odkaz:
http://arxiv.org/abs/cond-mat/0401377
Publikováno v:
Phys. Rev. Lett. 89, 116801 (2002)
Brownian heat engines use local temperature gradients in asymmetric potentials to move particles against an external force. The energy efficiency of such machines is generally limited by irreversible heat flow carried by particles that make contact w
Externí odkaz:
http://arxiv.org/abs/cond-mat/0201087