Block conjugated polymer, preparation method thereof and use thereof

Abstract

The invention discloses a block conjugated polymer, a preparation method thereof and use thereof. The structural general formula of the block conjugated polymer is represented by a formula I. In the invention, diazosulfide serving as a receptor is subjected to side-group modification, the obtained block conjugated polymer is improved in dissolubility and crystallinity and reduced in steric hindrance of the alkyl chains, and thus high organic solar cell efficiency is achieved. Therefore, the block conjugated polymer provided by the invention has a promising application prospect in solar cells.

Description

technical field The invention relates to a class of block conjugated polymers, a preparation method and application thereof. Background technique Solar energy, as a renewable energy source, has aroused the interest of many researchers, and solar cells have emerged as the times require. Compared with inorganic silicon solar cells, organic polymer solar cells have the advantages of plasticity and low price, but the energy conversion efficiency is still relatively low, which does not meet the application requirements. Therefore, designing new polymer structures to improve battery efficiency has become a hot topic in the field of organic polymer solar cell research. Based on the literature on polymer organic solar cells that have been reported, the designed structures mainly include the following: (i) take polythiophene as the main chain, and change the 3-position side group of thiophene (Hou, J.; Tan, Z.; Yan, Y.; He, Y.; Yang, C.; Li, Y.J.Am.Chem.Soc., 2006, 128, 4911); (ii)...

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Problems solved by technology

However, for the third type of polymer, in order to change the solubility, side groups of alkyl chains are often introduced on the donor unit, thereby reducing the crystallization properties of the polymer main chain. For example, in the literature, carbazole is used as the donor Polymers with two alkyl chains introduced on the carbazole unit, the efficiency is only 3.6% (Blouin, N.; Michaud, A.; Leclerc, M. Adv. Mater., 2007, 19, 2295.)

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