0000000000237259

AUTHOR

Marisol Martín-gonzález

showing 3 related works from this author

Nanowires: A route to efficient thermoelectric devices

2019

Miniaturization of electronic devices aims at manufacturing ever smaller products, from mesoscopic to nanoscopic sizes. This trend is challenging because the increased levels of dissipated power demands a better understanding of heat transport in small volumes. A significant amount of the consumed energy in electronics is transformed into heat and dissipated to the environment. Thermoelectric materials offer the possibility to harness dissipated energy and make devices less energy-demanding. Heat-to-electricity conversion requires materials with a strongly suppressed thermal conductivity but still high electronic conduction. Nanowires can meet nicely these two requirements because enhanced …

Materials scienceNanowireFOS: Physical sciences02 engineering and technology01 natural sciencesThermal conductivityMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesThermoelectric effectMiniaturizationElectronicsThermoelectric nanowires010306 general physicsPhonon scatteringCondensed Matter - Mesoscale and Nanoscale PhysicsHeat transport021001 nanoscience & nanotechnologyCondensed Matter PhysicsThermal conductionThermoelectric materialsEngineering physicsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsHeat to current conversion0210 nano-technology
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The fingerprint of Te-rich and stoichiometric Bi2Te3 nanowires by Raman spectroscopy

2016

We unambiguously show that the signature of Te-rich bismuth telluride is the appearance of three new peaks in the Raman spectra of Bi2Te3, located at 88, 117 and 137 cm−1 . For this purpose, we have grown stoichiometric Bi2Te3 nanowires as well as Te-rich nanowires. The absence of these peaks in stoichiometric nanowires, even in those with the smallest diameter, shows that they are not related to confinement effects or the lack of inversion symmetry, as stated in the literature, but to the existence of Te clusters. These Te clusters have been found in nonstoichiometric samples by high resolution electron microscopy, while they are absent in stoichiometric samples. The Raman spectra of the l…

Materials sciencePoint reflectionAnalytical chemistryNanowireBioengineeringNanotechnology02 engineering and technology010402 general chemistry01 natural scienceschemistry.chemical_compoundsymbols.namesakeHigh resolution electron microscopyThermoelectric effectGeneral Materials ScienceBismuth tellurideElectrical and Electronic EngineeringMechanical EngineeringGeneral ChemistryBismuth tellurideThermoelectricity021001 nanoscience & nanotechnology0104 chemical sciencesTEM-EDXchemistryMechanics of MaterialsRaman spectroscopysymbols0210 nano-technologyRaman spectroscopyStoichiometry
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Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films

2021

Novel thermoelectric materials developed for operation at room temperature must have similar or better performance along with being as ecofriendly as those commercially used, e.g., BiTe, in terms of their toxicity and cost. In this work, we present an in-depth study of the thermoelectric properties of epitaxial Nb-doped strontium titanate (SrTiNbO) thin films as a function of (i) doping concentration, (ii) film thickness and (iii) substrate type. The excellent crystal quality was confirmed by high resolution transmission electron microscopy and X-ray diffraction analysis. The thermoelectric properties were measured by the three-omega method (thermal conductivity) and van der Pauw method (el…

Materials scienceBioengineering02 engineering and technology010402 general chemistryMaximum power factor01 natural scienceschemistry.chemical_compoundVan der Pauw methodSeebeck coefficientThermoelectric effectFigure of meritGeneral Materials ScienceHigh-resolution transmission electron microscopyDoping concentrationLanthanum Strontium AluminateThermo-Electric materialsbusiness.industryDopingGeneral EngineeringThermoelectric figure of meritGeneral Chemistry021001 nanoscience & nanotechnologyThermoelectric materialsAtomic and Molecular Physics and Optics0104 chemical scienceschemistryThermoelectric propertiesStrontium titanateOptoelectronicsDifferent substratesSeebeck coefficient measurement0210 nano-technologybusiness
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