P-type conjugated polymer containing 3,4-dicyanothiophene, and preparation method and application thereof

Abstract

The invention discloses a p-type conjugated polymer containing 3,4-dicyanothiophene, and a preparation method and an application thereof. The method comprises the following steps: mixing a thiophene unit monomer containing 3,4-dicyanothiophene, a monomer containing a conjugated unit Ar1 and a monomer containing a conjugated unit Ar2, then performing polymerization reaction under catalysis of a catalyst, and purifying the obtained reaction product to obtain the p-type conjugated polymer containing 3,4-dicyanothiophene. The polymer provided by the invention is simple to synthesize, the introduction of a cyano group can regulate the energy level of the molecule, and the cyano group has a low molecular orbital energy level and a wide optical band gap, and can achieve good optical absorption complementation with an n-type organic semiconductor material; and compared with conjugated polymers free from the cyano substituent, the conjugated polymer containing 3,4-dicyanothiophene has the advantages of large dipole moment, high dielectric constant, facilitation of the reduction of exciton binding energy, promotion of the separation of electrons and holes, and realization of the preparationof high-performance organic solar cells.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials and applications, and specifically relates to a class of p-type conjugated polymers containing 3,4-dicyanothiophene, a preparation method and applications thereof. Background technique [0002] Organic solar cells have attracted much attention due to their low cost, light weight, flexibility, and large-area solution processing. The active layer of organic solar cells is usually composed of conjugated polymers as electron donors and fullerene derivatives as electron acceptors. Fullerene derivatives are limited by their narrow absorption spectrum, difficulty in structural modification, and high preparation costs. In the past three years, thanks to the development of A-D-A type non-fullerene small molecules (SMAs), the performance of fullerene as an electron acceptor material for organic solar cells has been improved and used on a large scale. The photoelectric conversion efficiency ...

AI Technical Summary

Problems solved by technology

Although some wide-bandgap donor polymers have achieved high device performance in organic solar cells, most of the donor polymers have high HOMO, and it is difficult to make V oc Therefore, the design of donor polymers with deep HOMO energy levels is particularly important for breakthroughs in the photoelectric conversion efficiency of organic solar cells.

Images