The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Tsutomu Kanno - One of the best experts on this subject based on the ideXlab platform.
-
Transverse Thermoelectric Effect and its applications using synthetically or naturally anisotropic materials
2016 IEEE International Meeting for Future of Electron Devices Kansai (IMFEDK), 2016Co-Authors: Tsutomu KannoAbstract:Transverse Thermoelectric Effect is a thermal to electric energy conversion, where the direction of electric field is perpendicular to the direction of heat flow. This phenomenon makes it possible to decouple thermal and electric current paths and provides design flexibility of Thermoelectric devices. This paper describes a basic concept of transverse Thermoelectric devices.
-
Detection of thermal radiation, sensing of heat flux, and recovery of waste heat by the transverse Thermoelectric Effect
Journal of Electronic Materials, 2014Co-Authors: Tsutomu Kanno, Hiromasa Tamaki, Hideo Kusada, Akihiro Sakai, Kouhei Takahashi, Yuka YamadaAbstract:The transverse Thermoelectric Effect is unique in that an output voltage can be extracted in the direction perpendicular to the input temperature gradient. This paper describes how this transverse feature can be exploited to realize simple and promising configurations of Thermoelectric devices. For detection of thermal radiation, two-dimensional imaging has been demonstrated by a fabricated sensor array of tilt-oriented CaxCoO2 epitaxial thin film. We have also developed a serpentine heat flux sensor made of multilayered Bi/Cu, and Bi0.5Sb1.5Te3/Ni tubular Thermoelectric devices for power generation. The fabrication processes and test results are presented.
-
Off-diagonal Thermoelectric Effect in tilted layered materials
2011 IEEE Nanotechnology Materials and Devices Conference, 2011Co-Authors: Kouhei Takahashi, Tsutomu Kanno, Akihiro Sakai, Atsushi Omote, Hideaki Adachi, Yuka YamadaAbstract:Off-diagonal Thermoelectric Effect is an unconventional Thermoelectric phenomenon which emerges in layered materials with tilted alignment. Here, we report development of unique functionalities using the off-diagonal Thermoelectric Effect in two different material systems; (i) tilted-oriented thin films of layered cobaltite Ca x CoO 2 , and (ii) artificial tilted multilayer of Bi/Cu and Bi 0.5 Sb 1.5 Te 3 /Ni. Ca x CoO 2 thin films enabled generation of an extremely large film in-plane voltage of 1 V by introducing a unit temperature difference in the film out-of-plane. On the other hand, Bi/Cu multilayer showed enhanced power factor of 50.1 µW/cmK2, which was ∼1.5 times larger than that of the constituent Bi alone. We also realized high electrical power generation of 1.3 W in the Bi 0.5 Sb 1.5 Te 3 /Ni multilayer fabricated in a tubular structure. These features provide potential applications to sensitive optical/thermal sensors and high-power Thermoelectric generators.
-
Gigantic transverse voltage induced via off-diagonal Thermoelectric Effect in CaxCoO2 thin films
Applied Physics Letters, 2010Co-Authors: Kouhei Takahashi, Tsutomu Kanno, Akihiro Sakai, Hideaki Adachi, Yuka YamadaAbstract:Gigantic transverse voltages exceeding several tens volt have been observed in CaxCoO2 thin films with tilted c-axis orientation upon illumination of nanosecond laser pulses. The voltage signals were highly anisotropic within the film surface showing close relation with the c-axis tilt direction. The magnitude and the decay time of the voltage strongly depended on the film thickness. These results confirm that the large laser-induced voltage originates from a phenomenon termed the off-diagonal Thermoelectric Effect, by which a film out-of-plane temperature gradient leads to generation of a film in-plane voltage.
-
The off-diagonal Thermoelectric Effect in inclinedly oriented thin films of layered cobaltite CaxCoO2
Journal of Physics D: Applied Physics, 2010Co-Authors: Kouhei Takahashi, Akihiro Sakai, Hideaki Adachi, Tsutomu KannoAbstract:The Thermoelectric properties of inclinedly oriented thin films of layered cobaltite CaxCoO2 have been investigated in response to infrared lamp heating. Upon heating the film surface, anisotropic voltage signals were identified along the film in-plane directions, which showed a close relation to the inclined crystal orientation. We demonstrate that the anisotropic features are a clear representation of the unconventional off-diagonal Thermoelectric Effect, where a film out-of-plane temperature gradient generates a voltage signal in the film in-plane direction. Utilizing this Effect, CaxCoO2 films allow us to produce film in-plane voltages of several hundred millivolts by a unit temperature differential in the film out-of-plane direction. The evident observation of the off-diagonal Thermoelectric Effect in the layered cobaltites shall renew the interest in this Effect, which has so far been developed only in materials that are conventionally not regarded as Thermoelectrics.
Yong Wang - One of the best experts on this subject based on the ideXlab platform.
-
highly sensitive heat flux sensor based on the transverse Thermoelectric Effect of yba2cu3o7 δ thin film
Applied Physics Letters, 2020Co-Authors: Shijin Song, Yong Wang, Lan YuAbstract:Thin film heat flux sensors with the size of 5 mm × 3 mm have been fabricated by growing c-axis tilted YBa2Cu3O7−δ thin films on miscut SrTiO3 (001) substrates. The Seebeck coefficient anisotropy between the ab-plane and the c-axis of the YBa2Cu3O7−δ thin film is utilized to generate the output voltage of the heat flux sensor via the transverse Thermoelectric Effect. The sensitivities of 104.9, 174.1, and 220.9 μV cm2/W have been achieved in nominal 5°, 10°, and 15° inclined thin films, respectively. Such a sensitivity of 220.9 μV cm2/W exceeds a sensitivity of 180.3 μV cm2/W from a standard and water-cooled Gardon gauge. In addition, the fast response time in the range of 15–40 ms has been identified in these sensors based on the transverse Thermoelectric Effect, which is significantly superior to 400 ms of the Gardon gauge. These results may provide an approach to manufacture highly sensitive heat flux sensors with a low cost, in contrast to the traditional thin film heat flux sensors with complicated micro-fabrication processes.
-
Highly sensitive heat flux sensor based on the transverse Thermoelectric Effect of YBa2Cu3O7−δ thin film
Applied Physics Letters, 2020Co-Authors: Shijin Song, Yong WangAbstract:Thin film heat flux sensors with the size of 5 mm × 3 mm have been fabricated by growing c-axis tilted YBa2Cu3O7−δ thin films on miscut SrTiO3 (001) substrates. The Seebeck coefficient anisotropy between the ab-plane and the c-axis of the YBa2Cu3O7−δ thin film is utilized to generate the output voltage of the heat flux sensor via the transverse Thermoelectric Effect. The sensitivities of 104.9, 174.1, and 220.9 μV cm2/W have been achieved in nominal 5°, 10°, and 15° inclined thin films, respectively. Such a sensitivity of 220.9 μV cm2/W exceeds a sensitivity of 180.3 μV cm2/W from a standard and water-cooled Gardon gauge. In addition, the fast response time in the range of 15–40 ms has been identified in these sensors based on the transverse Thermoelectric Effect, which is significantly superior to 400 ms of the Gardon gauge. These results may provide an approach to manufacture highly sensitive heat flux sensors with a low cost, in contrast to the traditional thin film heat flux sensors with complicated micro-fabrication processes.
Yoseph Imry - One of the best experts on this subject based on the ideXlab platform.
-
Unconventional four-terminal Thermoelectric transport due to inelastic transport: Cooling by transverse heat current, transverse Thermoelectric Effect, and Maxwell demon
Physical Review B, 2021Co-Authors: Jian-hua Jiang, Yoseph ImryAbstract:We show that, in mesoscopic four-terminal Thermoelectric devices with two electrodes (the source and the drain) and two heat baths, inelastic-scattering processes can lead to unconventional Thermoelectric transport. The source (or the drain) can be cooled by passing a thermal current between the two heat baths, with no net heat exchange between the heat baths and the electrodes. This Effect, termed ``cooling by transverse heat current,'' is a mesoscopic heat drag Effect. In addition, there is a transverse Thermoelectric Effect where electrical current and power can be generated by a transverse temperature bias (i.e., the temperature bias between the two heat baths). This transverse Thermoelectric Effect originates from inelastic-scattering processes and may have advantages for improved figures of merit and power factor due to spatial separation of charge and heat transport. We study the Onsager current-affinity relations, the linear-response transport properties, and the transverse Thermoelectric figure of merit of the four-terminal Thermoelectric devices for various system parameters. We find that the figures of merit are optimized in different parameter regions for the transverse and the (conventional) longitudinal Thermoelectric Effects, respectively. Meanwhile, the maximum figure of merit for the transverse Thermoelectric Effect is higher than the figure of merit for the conventional longitudinal Thermoelectric Effect. In addition, we investigate the efficiency and power of the cooling by the transverse heat current Effect in both linear and nonlinear transport regimes. Finally, we demonstrate that, by exploiting the inelastic transport in the quantum-dot four-terminal systems, a type of Maxwell demon can be realized using nonequilibrium heat baths.
-
Unconventional four-terminal Thermoelectric transport due to inelastic transport: cooling by transverse current, transverse Thermoelectric Effect and Maxwell demon
arXiv: Mesoscale and Nanoscale Physics, 2020Co-Authors: Jian-hua Jiang, Yoseph ImryAbstract:We show that in mesoscopic four-terminal Thermoelectric devices with two electrodes (the source and the drain) and two heat baths, inelastic scattering processes can lead to unconventional Thermoelectric transport. The source (or the drain) can be cooled by passing a thermal current between the two heat baths, with no net heat exchange between the heat baths and the electrodes. This Effect, termed as cooling by heat current, is a mesoscopic heat drag Effect. In addition, there is a transverse Thermoelectric Effect where electrical current and power can be generated by a transverse temperature bias (i.e., the temperature bias between the two heat baths). This transverse Thermoelectric Effect, originates from inelastic scattering processes, may have advantages for improved figures of merit and power factor due to spatial separation of charge and heat transport. We study the Onsager current-affinity relations, the linear-response transport properties, and the transverse Thermoelectric figure of merit of the four-terminal Thermoelectric devices for various system parameters. In addition, we investigate the efficiency and power of the cooling by transverse current Effect in both linear and nonlinear transport regimes. We also demonstrate that by exploiting the inelastic transport in the quantum-dot four-terminal systems, a type of Maxwell's demon can be realized using nonequilibrium heat baths.
Kouhei Takahashi - One of the best experts on this subject based on the ideXlab platform.
-
Detection of thermal radiation, sensing of heat flux, and recovery of waste heat by the transverse Thermoelectric Effect
Journal of Electronic Materials, 2014Co-Authors: Tsutomu Kanno, Hiromasa Tamaki, Hideo Kusada, Akihiro Sakai, Kouhei Takahashi, Yuka YamadaAbstract:The transverse Thermoelectric Effect is unique in that an output voltage can be extracted in the direction perpendicular to the input temperature gradient. This paper describes how this transverse feature can be exploited to realize simple and promising configurations of Thermoelectric devices. For detection of thermal radiation, two-dimensional imaging has been demonstrated by a fabricated sensor array of tilt-oriented CaxCoO2 epitaxial thin film. We have also developed a serpentine heat flux sensor made of multilayered Bi/Cu, and Bi0.5Sb1.5Te3/Ni tubular Thermoelectric devices for power generation. The fabrication processes and test results are presented.
-
Off-diagonal Thermoelectric Effect in tilted layered materials
2011 IEEE Nanotechnology Materials and Devices Conference, 2011Co-Authors: Kouhei Takahashi, Tsutomu Kanno, Akihiro Sakai, Atsushi Omote, Hideaki Adachi, Yuka YamadaAbstract:Off-diagonal Thermoelectric Effect is an unconventional Thermoelectric phenomenon which emerges in layered materials with tilted alignment. Here, we report development of unique functionalities using the off-diagonal Thermoelectric Effect in two different material systems; (i) tilted-oriented thin films of layered cobaltite Ca x CoO 2 , and (ii) artificial tilted multilayer of Bi/Cu and Bi 0.5 Sb 1.5 Te 3 /Ni. Ca x CoO 2 thin films enabled generation of an extremely large film in-plane voltage of 1 V by introducing a unit temperature difference in the film out-of-plane. On the other hand, Bi/Cu multilayer showed enhanced power factor of 50.1 µW/cmK2, which was ∼1.5 times larger than that of the constituent Bi alone. We also realized high electrical power generation of 1.3 W in the Bi 0.5 Sb 1.5 Te 3 /Ni multilayer fabricated in a tubular structure. These features provide potential applications to sensitive optical/thermal sensors and high-power Thermoelectric generators.
-
Gigantic transverse voltage induced via off-diagonal Thermoelectric Effect in CaxCoO2 thin films
Applied Physics Letters, 2010Co-Authors: Kouhei Takahashi, Tsutomu Kanno, Akihiro Sakai, Hideaki Adachi, Yuka YamadaAbstract:Gigantic transverse voltages exceeding several tens volt have been observed in CaxCoO2 thin films with tilted c-axis orientation upon illumination of nanosecond laser pulses. The voltage signals were highly anisotropic within the film surface showing close relation with the c-axis tilt direction. The magnitude and the decay time of the voltage strongly depended on the film thickness. These results confirm that the large laser-induced voltage originates from a phenomenon termed the off-diagonal Thermoelectric Effect, by which a film out-of-plane temperature gradient leads to generation of a film in-plane voltage.
-
The off-diagonal Thermoelectric Effect in inclinedly oriented thin films of layered cobaltite CaxCoO2
Journal of Physics D: Applied Physics, 2010Co-Authors: Kouhei Takahashi, Akihiro Sakai, Hideaki Adachi, Tsutomu KannoAbstract:The Thermoelectric properties of inclinedly oriented thin films of layered cobaltite CaxCoO2 have been investigated in response to infrared lamp heating. Upon heating the film surface, anisotropic voltage signals were identified along the film in-plane directions, which showed a close relation to the inclined crystal orientation. We demonstrate that the anisotropic features are a clear representation of the unconventional off-diagonal Thermoelectric Effect, where a film out-of-plane temperature gradient generates a voltage signal in the film in-plane direction. Utilizing this Effect, CaxCoO2 films allow us to produce film in-plane voltages of several hundred millivolts by a unit temperature differential in the film out-of-plane direction. The evident observation of the off-diagonal Thermoelectric Effect in the layered cobaltites shall renew the interest in this Effect, which has so far been developed only in materials that are conventionally not regarded as Thermoelectrics.
-
Tailoring of inclined crystal orientation in layered cobaltite thin films for the development of off-diagonal Thermoelectric Effect
Applied Physics Letters, 2009Co-Authors: Kouhei Takahashi, Tsutomu Kanno, Akihiro Sakai, Hideaki AdachiAbstract:A highly inclined CoO2 plane orientation was realized in CaxCoO2 thin films grown on sapphire single crystal substrates. The inclination angle of the CoO2 plane orientation was controlled by changing the inclination angle of the sapphire(0001) plane with respect to the substrate surface and additionally by introducing an epitaxial buffer layer of hematite. We demonstrate that the highly inclined crystal orientation results in a unique off-diagonal Thermoelectric Effect with a potential to produce a voltage signal of up to 600 mV along the film in-plane direction by a unit temperature difference along the film out-of-plane direction.
Shijin Song - One of the best experts on this subject based on the ideXlab platform.
-
highly sensitive heat flux sensor based on the transverse Thermoelectric Effect of yba2cu3o7 δ thin film
Applied Physics Letters, 2020Co-Authors: Shijin Song, Yong Wang, Lan YuAbstract:Thin film heat flux sensors with the size of 5 mm × 3 mm have been fabricated by growing c-axis tilted YBa2Cu3O7−δ thin films on miscut SrTiO3 (001) substrates. The Seebeck coefficient anisotropy between the ab-plane and the c-axis of the YBa2Cu3O7−δ thin film is utilized to generate the output voltage of the heat flux sensor via the transverse Thermoelectric Effect. The sensitivities of 104.9, 174.1, and 220.9 μV cm2/W have been achieved in nominal 5°, 10°, and 15° inclined thin films, respectively. Such a sensitivity of 220.9 μV cm2/W exceeds a sensitivity of 180.3 μV cm2/W from a standard and water-cooled Gardon gauge. In addition, the fast response time in the range of 15–40 ms has been identified in these sensors based on the transverse Thermoelectric Effect, which is significantly superior to 400 ms of the Gardon gauge. These results may provide an approach to manufacture highly sensitive heat flux sensors with a low cost, in contrast to the traditional thin film heat flux sensors with complicated micro-fabrication processes.
-
Highly sensitive heat flux sensor based on the transverse Thermoelectric Effect of YBa2Cu3O7−δ thin film
Applied Physics Letters, 2020Co-Authors: Shijin Song, Yong WangAbstract:Thin film heat flux sensors with the size of 5 mm × 3 mm have been fabricated by growing c-axis tilted YBa2Cu3O7−δ thin films on miscut SrTiO3 (001) substrates. The Seebeck coefficient anisotropy between the ab-plane and the c-axis of the YBa2Cu3O7−δ thin film is utilized to generate the output voltage of the heat flux sensor via the transverse Thermoelectric Effect. The sensitivities of 104.9, 174.1, and 220.9 μV cm2/W have been achieved in nominal 5°, 10°, and 15° inclined thin films, respectively. Such a sensitivity of 220.9 μV cm2/W exceeds a sensitivity of 180.3 μV cm2/W from a standard and water-cooled Gardon gauge. In addition, the fast response time in the range of 15–40 ms has been identified in these sensors based on the transverse Thermoelectric Effect, which is significantly superior to 400 ms of the Gardon gauge. These results may provide an approach to manufacture highly sensitive heat flux sensors with a low cost, in contrast to the traditional thin film heat flux sensors with complicated micro-fabrication processes.
