Benzodithiophene polymer, its preparation method, semiconductor composition containing it, and solar cell using it

Abstract

The invention discloses a benzodithiophene polymer, its preparation method, a semiconductor composition containing it, and a solar cell using it. The benzodithiophene polymer has a structure represented by a formula shown in the specification; and in the formula, A1, A2, A3, B1, B2 and B3 are respectively independently selected from hydrogen, C1-C30 alkyl groups, C1-C30 alkyloxy groups, cyan groups, nitro groups, ester groups, aryl groups with four following substituent groups RX, heteroaryl groups with four following substituent groups RX, aralkyl groups with four following substituent groups RX, halogen atoms, halogenated alkyl groups, heteroalkyl groups, alkenyl groups and alkynyl groups; the substituent groups RX comprise hydrogen, C1-C30 alkyl groups, C1-C30 alkyloxy groups, ester groups, sulfonyl groups or fluorinated alkyl groups. The introduction of a thiophene side chain to benzodithiophene makes the obtained polymer molecule have a high conjugate degree, so it is in favor of improving the carrier mobility of the above polymer material.

Description

technical field [0001] The invention relates to the field of polymer solar cells, in particular to a benzodithiophene polymer, a preparation method thereof, a semiconductor composition comprising the same and a solar cell using the same. Background technique [0002] With the development of human society, higher and higher requirements are put forward for energy utilization technology. Solar energy is an inexhaustible and inexhaustible clean energy. Today, with the depletion of petrochemical energy and increasingly serious environmental pollution, solar cells that can convert solar energy into electrical energy have become a research hotspot that countries are particularly concerned about. [0003] According to the different active materials used, solar cells are generally classified into inorganic solar cells and organic solar cells. Compared with the basically mature inorganic solar cells, the advantages of organic solar cells, especially polymer solar cells in organic so...

AI Technical Summary

Problems solved by technology

However, compared with inorganic semiconductor solar cells, the photoelectric conversion efficiency of polymer solar cells is not high enough, and the electrical properties are not yet stable.

The long-term research results of chemists and material scientists show that the main factors restricting the photoelectric conversion efficiency of polymer solar cells include: the spectral response range of the battery does not match the radiation spectrum of sunlight to the ground, and the mobility of carriers is not high. And the collection efficiency of the electrode to the carrier is low, etc.

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