9:30 AM - 11:30 AM
▲ [21a-P02-37] Single-material-based anomalous Nernst thermopile driven by solar heating and radiative cooling
Keywords:anomalous Nernst effect, spin caloritronics, thermoelectrics
The anomalous Nernst effect (ANE) is the transverse thermoelectric conversion phenomenon appearing in a magnetic material, which generates an electric field in the direction perpendicular to the magnetization and the temperature gradient. Owing to the unique symmetry of ANE, this phenomenon has attracted increasing interest because the voltage (power) induced by ANE can easily be enhanced by elongating the device length (enlarging the device area) perpendicular to temperature gradient. In order to elongate the device length effectively, the lateral zigzag configuration called the anomalous Nernst thermopile is often used, which is suitable for heat flux sensing applications. However, the conventional anomalous Nernst thermopile comprises two different materials; such a complicated structure degrades the advantage of ANE.
In this talk, we report a proof-of-concept demonstration of the single-material-based anomalous Nernst thermopile driven by solar heating and radiative cooling. The anomalous Nernst thermopile proposed here consists of a zigzag-shaped single magnetic material without any junction structures and black ink coated alternately on the wires arranged in the zigzag configuration. Our outdoor experiments proved that the proposed device enabled thermoelectric conversion whole day by solar heating and radiative cooling without using an external heater. We also confirmed this concept by indoor experiments using a solar simulator and a Peltier stage to emulate the outdoor environment with high controllability; the voltage generated from the proposed structure increases by an order of magnitude compared to an uncoated structure under the condition with solar heating and radiative cooling, which can further be enhanced in proportion to the number of wires. Significantly, this device concept is applicable to any magnetic materials, and thus may pave the way for outdoor thermoelectric applications based on ANE.
In this talk, we report a proof-of-concept demonstration of the single-material-based anomalous Nernst thermopile driven by solar heating and radiative cooling. The anomalous Nernst thermopile proposed here consists of a zigzag-shaped single magnetic material without any junction structures and black ink coated alternately on the wires arranged in the zigzag configuration. Our outdoor experiments proved that the proposed device enabled thermoelectric conversion whole day by solar heating and radiative cooling without using an external heater. We also confirmed this concept by indoor experiments using a solar simulator and a Peltier stage to emulate the outdoor environment with high controllability; the voltage generated from the proposed structure increases by an order of magnitude compared to an uncoated structure under the condition with solar heating and radiative cooling, which can further be enhanced in proportion to the number of wires. Significantly, this device concept is applicable to any magnetic materials, and thus may pave the way for outdoor thermoelectric applications based on ANE.