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Showing 1 to 20 of 96 for “"Seebeck coefficient"”.
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Seebeck coefficient in organic semiconductors
… to the applied temperature differential is the Seebeck coefficient, a transport coefficient that complements measurements of electrical and thermal conductivity. The physical interpretation of the Seebeck coefficient is the entropy per charge carrier divided by its charge and is hence a direct …
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Electrical conductivity and Seebeck coefficient of gold ditelluride, The
Includes bibliographical references (pages 103-104).
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Nanoscale Thermoelectrics: A Study of the Absolute Seebeck Coefficient of Thin Films
… and <em>S</em>, σ, and κ are the Seebeck coefficient and electrical and thermal conductivities respectively. These characteristic material parameters have interdependent energy transport contributions that classically prohibit the optimization of one with out the detriment of …
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Effect of phonon transport on the Seebeck coefficient and thermal conductivity of silicon nanowire arrays
… conversion of heat to electricity by the Seebeck effect, but must provide scalable and cost-effective technology for practical waste heat harvesting. This dissertation explores the thermoelectric properties of electrochemically etched silicon nanowires through experiments, complemented by …
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Using first principles Destiny Functional Theory methods to model the Seebeck coefficient of bulk silicon
… three different models for determining the Seebeck coefficient - Parabolic Bands, Boltzmann's theory, and the 'Pudding Mold' approximation to Boltzmann's theory - were studied in depth and compared with experimental values. Here we show first principles calculations to yield Seebeck …
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Electronic Transport in Thermoelectric Bismuth Telluride
… measurements are electrical conductivity, Seebeck coefficient and Hall effect. An experimental apparatus for measuring Hall effect and electrical conductivity was designed, constructed and tested. Seebeck coefficient measurements were performed on a commercial instrument. The Hall effect …
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Thermoelectric properties of carbon nanotube films
… nanotube-based thermoelectric devices. The Seebeck coefficient is a intrinsic property of a thermoelectric material that correlates the voltage produced by a conductor and the temperature gradient applied to it. To measure the Seebeck coefficient of films, an experimental set-up was …
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First-principles study of phonon drag effect in SiGe alloys
… equation], where S, T, [sigma], K are the Seebeck coefficient, absolute temperature, electrical conductivity and thermal conductivity) are promising candidate materials for efficient solid-state devices for electricity generation, cooling and refrigeration. Over the past decades, there has …
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Development and Design of Self-Sensing SMAs using Thermoelectric Effect
Active research of SMAs has shown that its Seebeck coefficient is sensitive to its martensitic phase transformation and has the potential to determine the SMAs state of transformation. The combination of Shape Memory Alloys, which have a positive Seebeck coefficient, and Constantan which has a …
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Membranes for sustainable heat-to-electricity conversion
… and ionic thermovoltage output/apparent ionic Seebeck coefficient, employing scalable, green fabrication routes. This thesis presents tailored surface chemistries on cellulose for surface charge engineering and the effect of surface charge and membrane dimension, and architecture on ionic …
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Charge and Thermoelectric Transport in Semicrystalline Conjugated Polymers and Single-Walled Carbon Nanotube Networks
… of their field-effect mobility and gated Seebeck coefficient are investigated. When a temperature difference is applied to a conducting system, a thermal voltage builds up as a response. The Seebeck coefficient is the ratio of the thermal voltage to the temperature difference and …
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Electrical and structural properties of compositions in the systems Y₁₋ₓCaₓMnO₃ and La₁₋ₓCaₓMnO₃
<p>"Electrical conductivity, Seebeck coefficient, and thermogravimetric behavior of compositions in the system Y<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub> were studied as functions of temperature and ambient oxygen activity in order to determine the mechanism of electrical transport and defect …
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Experimental determination of the thermoelectric properties of porous silicon nanowires
… as well as nanocrystalline size. We measured the Seebeck coefficient and thermal conductivity from 30 K to 400 K by a frequency domain technique. Analysis of Seebeck coefficient reveals the electron scattering mechanism in porous silicon nanowire before and after post-doping. The carrier …
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INVESTIGATION OF ELECTRIC AND THERMOELECTRIC PROPERTIES OF GRAPHENE NANORIBBON
… properties of GNR. GNR on Si/SiO2 substrate. Seebeck coefficient S of GNR with width of ~70nm and length of 1µm was measured as a function of the back gate voltage at different ambient temperatures. At high temperatures, the Seebeck coefficient shows a decreasing with increasing temperature …
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Nanostructured thin film thermoelectric composite materials using conductive polymer PEDOT:PSS
… by low operating efficiencies due to their low Seebeck coefficient. In this research, we show an enhanced Seebeck coefficient at the interface of poly(3,4- ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) spin coated onto silicon substrates. The maximum Seebeck coefficient achieved was …
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Quantum control of the electronic and thermal properties of Fullerenes and Exohedral Fullerenes
… fullerenes exhibiting both positive and negative Seebeck coefficients will be needed and therefore I also calculate the thermoelectric properties of the naturally occurring fullerene C60 known as the buckyball together with an exohedral example namely C50Cl10. C60 is known to have a negative …
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Technology and engineering of liquid lithium for fusion applications
… measured relative to stainless steel, and the Seebeck coefficient of each of these materials has then been calculated. For molybdenum the Seebeck coefficient has a linear rise with temperature from SMo = 3.9 μVK-1 at 30 oC to 7.5 μVK-1 at 275 oC, while tungsten has a linear rise from SW = 1.0 …
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Thermoelectric and charge transport properties in doped and aligned conjugated polymers
… for the precise measurement of conductivity and Seebeck coefficient. Through the systematic screening of various conjugated polymer candidates, PBTTT has emerged as a frontrunner in terms of thermoelectric performance. However, it was intriguing to note that P8T2Z-C12, despite its high …
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System Design, Fabrication, and Characterization of Thermoelectric and Thermal Interface Materials for Thermoelectric Devices
… conductivity, thermal conductivity, and the Seebeck coefficient over the temperature range of potential use. However, despite considerable research on thermoelectric materials for decades, there is still significant scatter and disagreement in the literature regarding accurate …
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Thermoelectric Properties and Transport of Semicrystalline Conjugated Polymer and Single-Wall Carbon Nanotube Composites
… increase of electrical conductivity and the Seebeck coefficient. However, the thermoelectric transport within composites has not been fully understood due to the complexity in materials properties, morphologies and experimental methods. This thesis reports the thermoelectric properties and …
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