Conjugated polymer based on benzodithiophene units as well as preparation method and application thereof

Abstract

The invention discloses a conjugated polymer based on benzodithiophene units as well as a preparation method and application thereof. The conjugated polymer based on the benzodithiophene units has a structural formula shown in the specification, wherein n is an integer between 15 and 40. Compared with conventional organic conjugated polymers such as polyaniline, polypyrrole, polythiophene, polycarbazole and the like, the conjugated polymer based on the benzodithiophene units has relatively high carrier mobility due to the large planar pi electron conjugated structure and the strong pi-pi interaction, and further shows relatively high Seebeck coefficient and excellent thermoelectric performance. Meanwhile, the polymer is easily dissolved in common organic solvents such as dichloromethane, trichloromethane, chlorobenzene and the like, has good machinability and thermal stability and can be made into a large-area flexible thermoelectrical component.

Description

technical field [0001] The invention relates to the field of organic thermoelectric materials, in particular to a conjugated polymer based on benzodithiophene units, a preparation method and application thereof. Background technique [0002] With the increasingly tense energy supply and the increasingly serious environmental pollution, the importance of using thermoelectric materials to generate electricity from low-grade energy and waste heat to solve energy and environmental problems has gradually emerged. Thermoelectric materials are semiconductor functional materials that use the transport and interaction of carriers and phonons in solids to realize the mutual conversion between thermal energy and electrical energy. Their performance is usually determined by the thermoelectric figure of merit ZT=S 2 σT / κ to characterize, where S is the Seebeck coefficient of the material, σ is the electrical conductivity, T is the thermodynamic temperature, κ is the thermal conductivity,...

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a conjugated polymer based on benzodithiophene units and its preparation method and application, aiming at solving the problem of the electrical conductivity of the existing conjugated polymer after chemical doping and the Seebeck coefficient are still at a very low level, which leads to the problem that the power factor of the material is difficult to improve

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