Block conjugated polymer, and preparation method and use thereof

Abstract

The invention provides a block conjugated polymer used for preparing a high-efficiency organic photovoltaic device, and a preparation method thereof. The block conjugated polymer has a structure shown in a formula I, wherein Ar represents an aromatic ring unit, with the aromatic structure of benzene, thiophene, fluorene, carbazole, silicon-aromatic heterocyclic ring or thiazole heterocyclic ring, of a main polymer chain; R1 and R2 are substitution radicals of [1,2,5]thiadiazole[3,4-g]quinoxaline and diazosulfide respectively, and each of R1 and R2 has one of the structures of hydrogen atom, saturated alkane, double-bond alkane, triple-bond alkane, ether-oxygen chain, alkyl-chain amine and sulphydryl; m and n are numbers of structure-repeated units of the main polymer chain; the summation of m and n is an integer more than or equal to 4; and m is more than or equal to 0, while n is more than or equal to 0. The polymer has the characteristics of better matching with solar spectrums, steric hindrance reduction, crystallization property improvement, and vast application prospect on photoelectric functional devices, particularly on polymer solar cells.

Description

technical field The invention relates to a polymer for preparing an organic photovoltaic device, a preparation method and application thereof. Background technique Due to the need for the utilization of cheap renewable energy, more and more scientific researchers have turned their attention to the field of high-efficiency and cheap photovoltaic devices. Compared with inorganic semiconductor materials, organic photovoltaic systems based on polymers have the advantages of being cheap and easy to prepare. At the same time, the potential advantage of organic photovoltaic devices is that they can prepare large-area flexible devices, which cannot be achieved by inorganic semiconductor materials. . In recent years, the photoelectric conversion efficiency of organic photovoltaic devices has been rising, and has reached 6% at present. But as far as the reports of organic solar cells are concerned, the poor solar spectrum matching of the polymer active layer is the most prominent sh...

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Problems solved by technology

However, the preparation process of bilayer solar cells is relatively complicated, and solution-fab

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