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Showing 1 to 20 of 136 for “"Seebeck"”.
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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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Picosecond Spin Seebeck Effect in Magnetic Insulators
The spin Seebeck effect (SSE) refers to spin current generation in a magnetic insulator/non-magnetic metal heterostructure due to a thermal gradient and most SSE experiments typically use an electric current as heat source. This study uses Terahertz (THz) time-domain emission spectroscopy where a …
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Electrical conductivity and Seebeck coefficient of gold ditelluride, The
Includes bibliographical references (pages 103-104).
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The Seebeck effect in thin film CdS and ZnₓCd₁₋ₓS
Seebeck and resistivity measurements are made on thin film CdS and Zn<sub>x</sub>Cd<sub>1-x</sub>S samples in an apparatus of original design over a temperature range from near liquid nitrogen temperature to room temperature. The temperature dependence of mobility and carrier concentration is …
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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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Investigation of spin-caloric and spin-orbit torque materials by vectorial spin Seebeck measurements and an advanced x-ray magnetic reflectivity analysis
… A decade ago, the discovery of the spin Seebeck effect (SSE), which specifies the generation of a spin voltage as a result of a temperature gradient, introduced the new fields of spin caloric transport. Here, the longitudinal spin Seebeck effect (LSSE) is the most prominent caloritronic …
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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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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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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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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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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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Spin Shot Noise measurement
… a few per square micron. We also detected a spin Seebeck voltage noise in structures designed to measure the longitudinal spin Seebeck effect in yttrium iron garnet (YIG) on gadolinium gallium garnet (GGG). Measurements have shown indications at low temperatures of a contribution to the spin …
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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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First principles study of ternary skutterudites
… in this study. Transport properties, including Seebeck coefficient and electrical conductivity, are obtained from Boltzmann transport theory. The calculation results show high Seebeck coefficients and low electrical conductivities. Future work will focus on increasing the electrical conductivity …
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