Journal ArticleDOI
Improved Thermoelectric Power Factor in Metal-Based Superlattices
Daryoosh Vashaee,Ali Shakouri +1 more
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TLDR
It is shown that metal-based superlattices with tall barriers can achieve a large effective thermoelectric figure of merit (ZT > 5 at room temperature), a key parameter to achieving high performance is the nonconservation of lateral momentum during the thermionic emission process.Abstract:
In this paper we present a detailed theory of electron and thermoelectric transport perpendicular to heterostructure superlattices. This nonlinear transport regime above barriers is also called heterostructure thermionic emission. We show that metal-based superlattices with tall barriers can achieve a large effective thermoelectric figure of merit (ZT > 5 at room temperature). A key parameter to achieving high performance is the nonconservation of lateral momentum during the thermionic emission process. Conservation of lateral momentum is a consequence of translational symmetry in the plane of the superlattice. We also discuss the use of nonplanar barriers and embedded quantum dot structures to achieve high thermoelectric conversion efficiency.read more
Citations
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The influence of non-idealities on the thermoelectric power factor of nanostructured superlattices
TL;DR: In this paper, the authors employ quantum mechanical electronic transport simulations to outline the detrimental effects of random variation, imperfections and nonoptimal barrier shapes in a superlattice geometry on these predicted power factor improvements.
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Significant reduction in semiconductor interface resistance via interfacial atomic mixing
TL;DR: In this article , the authors employed Green's functions to study the charge transport across representative Si/Ge interfaces and found that disordered interfaces with certain symmetries create more nonspecular transmission.
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400 element ErAs:InGaAs/InGaAlAs superlattice power generator
Gehong Zeng,Je-Hyeong Bahk,John E. Bowers,Joshua M. O. Zide,Arthur C. Gossard,Yan Zhang,Rajeev Singh,Zhixi Bian,Ali Shakouri,Woochul Kim,Suzanne L. Singer,Arun Majumdar +11 more
TL;DR: In this paper, the authors report the fabrication and characterization of thin film power generators composed of 400 p-and n-type ErAs:InGaAs/InGaAlAs superlattice thermoelectric elements.
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Importance of electron-phonon coupling in thermal transport in metal/semiconductor multilayer films
Wuli Miao,Moran Wang +1 more
TL;DR: In this article , the authors investigated thermal transport in metal/semiconductor multilayer films using the coupled electron and phonon Boltzmann transport equations combined with the phonon diffuse mismatch model.
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Thermoelectric properties of nanoporous Si
TL;DR: In this article, the authors computed thermoelectric properties of nanoporous Ge with aligned pores along the [001] direction through a combined classical molecular dynamics and first-principles electronic structure approach.
References
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Journal ArticleDOI
Thin-film thermoelectric devices with high room-temperature figures of merit
TL;DR: Th thin-film thermoelectric materials are reported that demonstrate a significant enhancement in ZT at 300 K, compared to state-of-the-art bulk Bi2Te3 alloys, and the combination of performance, power density and speed achieved in these materials will lead to diverse technological applications.
Journal ArticleDOI
Quantum dot superlattice thermoelectric materials and devices.
TL;DR: It is demonstrated that improved cooling values relative to the conventional bulk (Bi,Sb)2(Se,Te)3thermoelectric materials using a n-type film in a one-leg thermoelectrics device test setup, which cooled the cold junction 43.7 K below the room temperature hot junction temperature of 299.8 K.
Journal ArticleDOI
Heterostructure integrated thermionic coolers
Ali Shakouri,John E. Bowers +1 more
TL;DR: In this paper, a single-stage room temperature cooling of high power electronic and optoelectronic devices is achieved by selective emission of hot electrons over a barrier layer from the cathode to the anode.
Journal ArticleDOI
Multilayer Thermionic Refrigeration
TL;DR: In this paper, a new method of refrigeration is proposed by thermionic emission of electrons over Schottky barriers between metals and semiconductors, which can have only a small temperature difference.
Journal ArticleDOI
Electronic and thermoelectric transport in semiconductor and metallic superlattices
Daryoosh Vashaee,Ali Shakouri +1 more
TL;DR: In this article, a detailed theory of nonisothermal electron transport perpendicular to multilayer superlattice structures is presented, and the currentvoltage and cooling power density are calculated using Fermi-Dirac statistics, density-of-states for a finite quantum well and the quantum mechanical reflection coefficient.