A preparation method of polyfluorene block conjugated polymer cathode buffer layer

Abstract

The invention discloses a preparation method of a polyfluorene block conjugated polymer cathode buffer layer. The polyfluorene block conjugated polymer is obtained through Kumada catalyst transfer coupling polymerization. First, ethylene glycol monomethyl ether, 2,7-dibromofluorene, 1,6-dibromohexane and diethylamine are used as raw materials to synthesize monomers, and chlorinated with 1,3-bisdiphenylphosphinopropane Nickel Ni(dppp)Cl2 is used as a catalyst, with dry tetrahydrofuran as a solvent, the monomer and 2,7-dibromo-9,9-bis(2-(2-(2-methoxyethoxy)ethoxy Base) ethyl)-fluorene monomer reaction polymerization. The obtained polymer was settled with n-hexane, extracted with a Soxhlet extractor, passed through a column with neutral alumina, and dried to obtain a light green solid. The block polymer can realize the processing of polar solvents such as water and alcohol, is environmentally friendly, can reduce the work function, and can improve the morphology of the upper active layer. It can be used as a good cathode buffer layer for devices such as solar cells, LEDs and FETs.

Description

technical field [0001] The invention relates to the technical field of organic solar cells, in particular to a method for preparing a cathode buffer layer based on a block polymer electrolyte. Background technique [0002] Environmental pollution is becoming more and more serious, and global energy demand is increasing year by year. The development and utilization of solar energy has become a hot topic in the world. Due to the complex production process, expensive production equipment, limited silicon material, and the conversion efficiency has basically reached the limit, the further development of traditional inorganic material photovoltaic cells is greatly restricted. In recent years, the research and development of conjugated polymers has made it possible to develop low-cost, large-area organic polymer photovoltaic cells. In addition, organic conjugated polymer thin film solar cells can be produced by roll-to-roll printing, which is cheap and efficient. Therefore, many ...

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Problems solved by technology

[0003] At present, the cathode buffer layer of organic solar cell devices is random or alternating conjugated polymer electrolytes containing quaternary ammonium salts, crown ethers, etc. The structure of random or alternating conjugated polymer electrolytes is disordered and cannot form a self-assembled structure.

The morphology of the upper active layer is still poor, and the morphology of the upper active layer cannot be improved

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