Abstract
This article reports giant magnetic field effects on the Seebeck coefficient by exerting a Lorentz force on charge diffusion based on vertical multi-layer ITO/PEDOT:PSS/Au thin-film devices. The Lorentz force, induced by an external magnetic field, changes the charge transport and consequently generates angular dependent magnetoresistance. The proposed mechanism of the magneto-Seebeck effect is proved by measuring the magnetoresistance at a parallel, 45o and perpendicular angle to the temperature gradient. The gradual change of the magnetoresistance from a parallel to perpendicular angle indicates that the Lorentz force is a key driving force to develop the magneto-Seebeck effect. Therefore, our experimental results demonstrate a magnetic approach to control the thermoelectric properties in organic materials.
Highlights
This article reports giant magnetic field effects on the Seebeck coefficient by exerting a Lorentz force on charge diffusion based on vertical multi-layer ITO/PEDOT:PSS/Au thin-film devices
The Seebeck coefficient is normally defined as S = ∆V/∆T, where ∆V is the electrical potential difference created by the temperature gradient, and ∆T is the temperature difference across the device
We measure the thermoelectric and magneto-thermoelectric properties of a semi-metallic polymer in the ITO/PEDOT:PSS/Au hybrid thin-film device and observe a significant change in the Seebeck coefficient when an external magnetic field is applied perpendicular to the temperature gradient
Summary
This article reports giant magnetic field effects on the Seebeck coefficient by exerting a Lorentz force on charge diffusion based on vertical multi-layer ITO/PEDOT:PSS/Au thin-film devices. The surface polarization has been demonstrated as an additional driving force to diffuse charge carriers in vertical hybrid architecture for the development of Seebeck effects.[30,31,32] In this work, we measure the thermoelectric and magneto-thermoelectric properties of a semi-metallic polymer in the ITO/PEDOT:PSS/Au hybrid thin-film device and observe a significant change in the Seebeck coefficient when an external magnetic field is applied perpendicular to the temperature gradient.
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