Flexible organic thermoelectric device and preparation method thereof

Abstract

The invention provides a flexible organic thermoelectric device and a preparation method thereof. The method comprises a dipping step of directly immersing a sewing thread in a conductive polymer solution, a coating step of uniformly winding the sewing thread adsorbed with a conductive polymer around an iron piece, coating two sides of the iron piece with a dopant and a silver paste to form uniformly spaced P-type and N-type thermoelectric material segments on the sewing thread, and standing until drying, and a step of sewing step of sewing the dried sewing thread to a flexible substrate withthe alternate P-type and N-type thermoelectric material segments, wherein independent structures which are electrically connected in series and thermally connected in parallel are formed between eachpair of the P-type and N-type thermoelectric material segments. According to the invention, a large film vertical distance can be obtained, therefore, the maintenance of the temperature difference between a cold end and a hot end is achieved, and the output power of the device is raised.

Description

technical field [0001] The invention relates to the technical field of organic thermoelectric devices, in particular to a flexible organic thermoelectric device and a preparation method thereof. Background technique [0002] Thermoelectric conversion technology is a technology that uses the Seebeck effect and Peltier effect of semiconductor materials to directly convert thermal energy and electrical energy. The thermoelectric conversion device does not need to use moving parts or toxic working fluids. [0003] It plays a very important role in solving the increasingly severe global energy and environmental problems, and has been developed and utilized in the utilization of industrial waste heat, solar thermal composite power generation and other fields. [0004] A thermoelectric conversion device generally consists of three parts: a heat source, a heat sink, and a thermopile. A thermopile is a series of thermoelectric pairs connected in series that convert heat energy into ...

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Problems solved by technology

[0006] In addition, thin-film thermoelectric devices generally have two preparation structures, one is that the heat conduction direction is parallel to the substrate surface, this method can reduce the resistance of the film, but also improve the thermal conductivity of the device; the other is that the heat conduction direction is perpendicular to the substrate surface. The surface of the substrate can reduce the thermal conductivity of the device, but since the height difference in the vertical direction of the film is only 500 nm ~ 100 μm, the heat sink end is very close to the heat source end, and the temperature difference between the heat sink end and the heat source end cannot be maintained, making the temperature difference battery output power is small

In addition, the current manufacturing process of thin-film thermoelectric batteries is still relatively complicated, the manufacturing cost is high, and the flexibility of the device is not enough, which further hinders the large-scale application of thin-film thermoelectric batteries.

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