A device for in-situ characterization of nanothermoelectric Seebeck coefficients based on scanning thermal microscopy

Abstract

The invention discloses a nano thermoelectrical Seebeck coefficient in-situ characterization device based on a scanning thermal microscope. The device is used for detecting the microcell Seebeck coefficient of thermal nano-materials. The device further comprises a scanning thermal microscope in-situ excitation platform of harmonic signals and a nano thermoelectrical Seebeck coefficient in-situ detection platform, wherein the microcell thermoelectrical Seebeck coefficient is as follows, wherein S is the microcell Seebeck coefficient, V<1omega>, V<2omega> and V<3omega> are a first harmonic generation harmonic signal, a second harmonic generation harmonic signal of a microcell of the thermal nano-materials and a third harmonic generation harmonic signal of the microcell of the thermal nano-materials respectively, and k is a coefficient. The nano-detection function of the scanning thermal microscope, a one-dimensional linear heat source model, the Joule heat effect principle and the macroscopic Seebeck coefficient testing principle are combined to build the new nano thermoelectrical Seebeck coefficient in-situ characterization device based on the scanning thermal microscope.

Description

technical field [0001] The application relates to a device for in-situ characterization of nano-thermoelectric Seebeck coefficients based on a scanning thermal microscope, which belongs to the field of signal detection instruments. Background technique [0002] Thermoelectric materials based on the mutual conversion effect of thermal energy and electrical energy have become an important strategic new energy material. The development of thermoelectric materials with high performance and high thermoelectric conversion efficiency has become an important development direction in the field of thermoelectric research. Due to the strong size effect and interface effect, nano-thermoelectric materials can greatly reduce the thermal conductivity of the material and improve the thermoelectric conversion efficiency, so it has become the most active and promising research field in the international thermoelectric field. At present, due to the particularity of the structure and performan...

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Problems solved by technology

At present, due to the particularity of the structure and performance of nano-thermoelectric materials and the failure of traditional thermoelectric testing methods, the in-situ quantitative characterization of the physical properties of nano-thermoelectric materials has been lacking so far, which restricts the development of nano-thermoelectric transport theory and the preparation of nano-thermoelectric materials. scientific development

The Seebeck coefficient is an important physical parameter of thermoelectric materials. At present, its characterization still uses the traditional method, that is, not only the temperature difference between the two ends of the material must be directly measured by a temperature sensor, but also the potential difference caused by the temperature difference must be measured simultaneously. This macroscopic test In situ quantitative characterization of nanothermoelectric Seebeck coefficients is difficult to achieve with technology

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