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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Methodology of Thermoelectric Power Factor Enhancement by Nanoscale Thermal Management in Bulk SiGe Composites
Shunya Sakane,Takafumi Ishibe,Kosei Mizuta,Masato Kashino,Kentaro Watanabe,Takeshi Fujita,Yoshinari Kamakura,Nobuya Mori,Yoshiaki Nakamura +8 more
TL;DR: In this paper, the authors proposed a methodology for thermoelectric power factor enhancement using nanoscale thermal management, which is composed of a high electrical conductivity (σ) material.
Journal ArticleDOI
Detrimental effects of impurity phases on the thermoelectric performance of Nb0.8Ti0.2Fe1.02Sb synthesized by arc-melting
Kahiu Joseph Ngugi,Woo Hyun Nam,Samuel Kimani Kihoi,Hyunji Kim,Juhee Ryu,Seonghoon Yi,Ho Seong Lee +6 more
TL;DR: In this article, the detrimental impacts of impurity phases on thermoelectric (TE) performance in Nb0.8Ti0.2Fe1.02Sb system were demonstrated.
Journal ArticleDOI
A theoretical study on the performances of thermoelectric heat engine and refrigerator with two-dimensional electron reservoirs
TL;DR: In this paper, the authors derived expressions for key thermoelectric performance parameters for the resonant transport processes, in which the transmission of electrons has been approximated as a Lorentzian resonance function.
Journal ArticleDOI
Effect of annealing on the structural and thermoelectric properties of nanostructured Sb2Te3/Au semiconductor/metal multilayer films
TL;DR: In this paper, the influence of thermal annealing temperature on the periodic nanostructures and the thermoelectric properties of Sb2Te3/Au multilayer thin films fabricated by magnetron sputtering was investigated.
Journal ArticleDOI
Modified embedded-atom method interatomic potential and interfacial thermal conductance of Si-Cu systems: A molecular dynamics study
TL;DR: In this paper, a modified embedded atom method interatomic potential for Si-Cu system has been set based upon previous MEAM potentials for pure Cu and pure Si, which is determined by fitting key properties of the alloy to results obtained by ab initio calculations.
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.