Two-dimensional benzo dithiophene group doped ternary random polymer acceptor material, and preparation method and applications thereof

Abstract

The invention relates to synthesis of a two-dimensional benzo dithiophene group doped ternary random polymer acceptor material, and applications thereof in all-polymer solar energy batteries, whereinthe two-dimensional benzo dithiophene group contains thiophane group side chains. According to a preparation method, doping of benzo dithiophene groups at different molar ratio is adopted to adjust the polymerization performance of the polymer material, improve the crystallization behaviors of all-polymer active layers, improve all-polymer solar energy battery short circuit current and filling factors, and increase energy conversion efficiency. Three monomers are subjected to Stille reaction so as to obtain the ternary random polymer; the synthesis technology is simple; the raw materials are easily available; the obtained products are easy to purify; three polymers of different properties are adopted as electron donors and the above series polymer acceptors are adopted to prepare all-polymer solar energy batteries, compared with conventional binary acceptor, higher energy conversion efficiency is achieved. It is confirmed that the method is capable of increasing all-polymer solar energy battery energy conversion efficiency objectively and effectively.

Description

technical field [0001] The invention relates to the field of organic photovoltaic materials, in particular to a ternary random polymer electron acceptor material doped with two-dimensional benzodithiophene (BDT) groups and its application in organic photovoltaics, more specifically in Applications in all-polymer solar cells. Background technique [0002] Organic photovoltaics, or organic solar cells, is a clean energy technology that utilizes the photovoltaic effect to generate electricity. Compared with inorganic solar cells, organic solar cells have the advantages of easy modification of material chemical structure, light weight, low price, flexible preparation, and solvent processing. After organic electron donor and acceptor active layer absorb photons, photons generate excitons, excitons dissociate into holes and electrons, and carrier transfer steps, organic photovoltaic devices can convert solar energy into electrical energy. [0003] According to the type of electr...

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Problems solved by technology

However, due to the strong planarity of its molecules, it usually forms too strong acceptor accumulation in the active layer, which affects the contact between the donor and acceptor, and forms an excessively large-scale phase separation of the donor and acceptor, which in turn affects the charge transfer. , suppressing the energy conversion efficiency of the device

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