1.
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11 p, 2.8 MB |
3D BiTe Interconnected Nanowire Networks to Increase Thermoelectric Efficiency
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Ruiz-Clavijo, Alejandra (Instituto de Micro y Nanotecnología) ;
Caballero-Calero, Olga (Instituto de Micro y Nanotecnología) ;
Manzano, Cristina V. (Instituto de Micro y Nanotecnología) ;
Maeder, Xavier (Swiss Federal Laboratories for Materials Science and Technology) ;
Beardo Ricol, Albert (Universitat Autònoma de Barcelona. Departament de Física) ;
Cartoixà Soler, Xavier (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) ;
Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ;
Martín-González, Marisol (Instituto de Micro y Nanotecnología)
3D interconnected nanowire scaffoldings are shown to increase the thermoelectric efficiency in comparison to similar diameter 1D nanowires and films grown under similar electrodeposition conditions. BiTe 3D nanonetworks offer a reduction in thermal conductivity (κ) while preserving the high electrical conductivity of the films. [...]
2021 - 10.1021/acsaem.1c02129
ACS Applied Energy Materials, Vol. 4, Issue 12 (December 2021) , p. 13556-13566
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2.
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6 p, 802.9 KB |
Observation of second sound in a rapidly varying temperature field in Ge
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Beardo Ricol, Albert (Universitat Autònoma de Barcelona. Departament de Física) ;
López-Suárez, Miquel (Institut de Ciència de Materials de Barcelona) ;
Pérez, Luis Alberto (Institut de Ciència de Materials de Barcelona) ;
Sendra, Lluc (Universitat Autònoma de Barcelona. Departament de Física) ;
Alonso Carmona, Maria Isabel (Institut de Ciència de Materials de Barcelona) ;
Melis, Claudio (Università di Cagliari. Dipartimento di Fisica) ;
Bafaluy Bafaluy, Javier (Universitat Autònoma de Barcelona. Departament de Física) ;
Camacho Castro, Juan (Universitat Autònoma de Barcelona. Departament de Física) ;
Colombo, Luciano (Università di Cagliari. Dipartimento di Fisica) ;
Rurali, Riccardo (Institut de Ciència de Materials de Barcelona) ;
Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ;
Reparaz, Juan Sebastian (Institut de Ciència de Materials de Barcelona)
Second sound is known as the thermal transport regime where heat is carried by temperature waves. Its experimental observation was previously restricted to a small number of materials, usually in rather narrow temperature windows. [...]
2021 - 10.1126/sciadv.abg4677
Science advances, Vol. 7, Issue 27 (June 2021) , art. eabg4677
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3.
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12 p, 5.5 MB |
A General and Predictive Understanding of Thermal Transport from 1D- and 2D-Confined Nanostructures : Theory and Experiment
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Beardo Ricol, Albert (Universitat Autònoma de Barcelona. Departament de Física) ;
Knobloch, Joshua L. (University of Colorado and NIST) ;
Sendra, Lluc (Universitat Autònoma de Barcelona. Departament de Física) ;
Bafaluy Bafaluy, Javier (Universitat Autònoma de Barcelona. Departament de Física) ;
Frazer, Travis D. (University of Colorado and NIST) ;
Chao, Weilun (Lawrence Berkeley National Laboratory) ;
Hernandez-Charpak, Jorge N. (University of Colorado and NIST) ;
Kapteyn, Henry C. (University of Colorado and NIST) ;
Abad Mayor, Begoña (University of Colorado and NIST) ;
Murnane, Margaret M. (University of Colorado and NIST) ;
Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ;
Camacho Castro, Juan (Universitat Autònoma de Barcelona. Departament de Física)
Heat management is crucial in the design of nanoscale devices as the operating temperature determines their efficiency and lifetime. Past experimental and theoretical works exploring nanoscale heat transport in semiconductors addressed known deviations from Fourier's law modeling by including effective parameters, such as a size-dependent thermal conductivity. [...]
2021 - 10.1021/acsnano.1c01946
ACS nano, Vol. 15, Issue 8 (August 2021) , p. 13019-13030
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4.
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7 p, 6.2 MB |
Ballistic Phonons in Ultrathin Nanowires
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Vakulov, Daniel (Eindhoven University of Technology) ;
Gireesan, Subash (Center for Computational Energy Research) ;
Swinkels, Milo Y. (University of Basel) ;
Chavez, Ruben (Eindhoven University of Technology) ;
Vogelaar, Tom (Eindhoven University of Technology) ;
Torres, Pol (Universitat Autònoma de Barcelona. Departament de Física) ;
Campo, Alessio (University of Basel) ;
De Luca, Marta (University of Basel) ;
Verheijen, Marcel A. (Eindhoven University of Technology) ;
Koelling, Sebastian (Eindhoven University of Technology) ;
Gagliano, Luca (Eindhoven University of Technology) ;
Haverkort, Jos E. M. (Eindhoven University of Technology) ;
Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona) ;
Bobbert, Peter A. (Center for Computational Energy Research) ;
Zardo, Ilaria (University of Basel) ;
Bakkers, Erik P. A. M. (Eindhoven University of Technology)
According to Fourier's law, a temperature difference across a material results in a linear temperature profile and a thermal conductance that decreases inversely proportional to the system length. These are the hallmarks of diffusive heat flow. [...]
2020 - 10.1021/acs.nanolett.0c00320
Nano letters, Vol. 20, Num. 4 (April 2020) , p. 2703-2709
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5.
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7 p, 1.1 MB |
Full-field thermal imaging of quasiballistic crosstalk reduction in nanoscale devices
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Ziabari, Amirkoushyar (Birck Nanotechnology Center) ;
Torres, Pol (Universitat Autònoma de Barcelona. Departament de Física) ;
Vermeersch, Bjorn (Commissariat à l'Énergie Atomique et aux Énergies Alternatives (França)) ;
Xuan, Yi (Birck Nanotechnology Center) ;
Cartoixà Soler, Xavier (Universitat Autònoma de Barcelona. Departament de Física) ;
Torelló, Alvar (Universitat Autònoma de Barcelona. Departament de Física) ;
Bahk, Je-Hyeong (Birck Nanotechnology Center) ;
Koh, Yee Rui (Birck Nanotechnology Center) ;
Parsa, Maryam (Purdue University. Electrical and Computer Engineering) ;
Ye, Peide D. (Birck Nanotechnology Center) ;
Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ;
Shakouri, Ali (Birck Nanotechnology Center)
Understanding nanoscale thermal transport is of substantial importance for designing contemporary semiconductor technologies. Heat removal from small sources is well established to be severely impeded compared to diffusive predictions due to the ballistic nature of the dominant heat carriers. [...]
2018 - 10.1038/s41467-017-02652-4
Nature communications, Vol. 9 (Jan. 2018) , art. 255
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6.
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7 p, 138.6 KB |
Robustness of the nonequilibrium entropy related to the Maxwell-Cattaneo heat equation
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Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ;
Casas Vázquez, José (Universitat Autònoma de Barcelona. Departament de Física) ;
Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física)
The connection between the Maxwell-Cattaneo heat transport equation and a nonequilibrium entropy is examined through four different thermodynamic approaches, and it is shown that all of them lead to the same form of the nonequilibrium entropy. [...]
2008 - 10.1103/PhysRevE.77.031110
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 77, Number 3 (March 2008) , p. 031110/1-031110-7
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8.
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4 p, 337.7 KB |
Cross-plane thermal conductivity reduction of vertically uncorrelated Ge/Si quantum dot superlattices
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Álvarez Quintana, Jaime (Universitat Autònoma de Barcelona. Departament de Física) ;
Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ;
Rodríguez-Viejo, Javier (Universitat Autònoma de Barcelona. Departament de Física) ;
Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física) ;
Lacharmoise, Paul Dominique (Institut de Ciència de Materials de Barcelona) ;
Bernardi, Alessandro (Institut de Ciència de Materials de Barcelona) ;
Goñi, Alejandro (Institut de Ciència de Materials de Barcelona) ;
Alonso Carmona, Maria Isabel (Institut de Ciència de Materials de Barcelona) ;
American Physical Society
A drastic reduction in temperature dependent cross-plane thermal conductivity κ occurs in Gequantum dotsuperlattices (QDSLs), depending on the vertical correlation between dots. Measurements show at least a twofold decrease of κ in uncorrelated dot structures as compared to structures with the same Si spacer of 20nm but good vertical dot alignment. [...]
2008 - 10.1063/1.2957038
Applied physics letters, Vol. 93, Issue 1 (July 2008) , p. 013112/1-013112/3
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9.
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4 p, 256.1 KB |
Pore-size dependence of the thermal conductivity of porous silicon : a phonon hydrodynamic approach
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Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ;
Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física) ;
Sellitto, A. (University of Basilicata. Department of Mathematics and Computer Science) ;
American Physical Society
Phononhydrodynamics is used to analyze the influence of porosity and of pore size on reduction in thermal conductivity in porous silicon, with respect to crystalline silicon. The expressions predict that the thermal conductivity is lower for higher porosity and for smaller pore radius, as a consequence of phononballisticeffects. [...]
2010 - 10.1063/1.3462936
Applied physics letters, Vol. 97, Issue 3 (July 2010) , p. 33103
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