A kind of whole furan skeleton donor-acceptor conjugated polymer, its preparation method and the organic solar cell prepared by using it

Abstract

The invention provides a per-furan framework donor-receptor conjugated polymer and a preparation method thereof as well as an organic solar cell made of the per-furan framework donor-receptor conjugated polymer. The structural formula of the polymer is shown in the description, wherein EH is shown in the description, and n is 24-25. The prepared polymer PBDFFPD is high in conjugate plane, high inin-molecule and inter-molecule mutual action, and low in HOMO energy level; a PBDFTD:ITIC based organic solar cell has 9.30% of photoelectric conversion efficiency under the collaborative processing of chloronaphthalene and methyl alcohol, and FF is up to 70.3%, so that the top record of the photoelectric conversion efficiency of an FTD based polymer organic solar cell is reached. In addition, thedeviation between the average efficiency and the maximum efficiency of a 20 battery under the optimal condition of the PBDFTD:ITIC cell is kept at 0.64%, so that the PBDFFTD is high in potential to prepare an efficient organic solar cell, and the operation is free from strict requirements; the polymer is suitable for popularization.

Description

technical field [0001] The invention belongs to the field of material chemistry and electrochemistry, and in particular relates to an all-furan skeleton donor-acceptor conjugated polymer, a preparation method thereof and an organic solar cell prepared by using the same. Background technique [0002] Organic Solar Cells (OSCs) have the characteristics of light weight, simple device structure, flexible devices that can be prepared in a large area by solution method, and can be applied to the field of translucent products. They are considered to be the star representatives of the new generation of photoelectric conversion methods. So far, the continuous efforts of scientific researchers in the synthesis of new materials, device structure improvement and interface optimization have made great progress in the photoelectric conversion efficiency of organic solar cells. In recent years, with the advent of the narrow-bandgap Induced-o-dithiophene (IDT) series of non-fullerene small-...

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Problems solved by technology

Although the photoelectric conversion efficiency of organic solar cells based on the aforementioned conjugated polymers is over 10% with IDT series non-fullerene small molecules as acceptors, the synthesis steps of these polymers are quite cumbersome, especially for these polymers. The receptor unit of PTB7-Th often requires multi-step reactions and lengthy post-processing. For example, the synthesis of the receptor unit thiophene[3,4-b]thiophene (TT) of PTB7-Th requires at least 7 steps, and the receptor unit of FTAz 2 The synthesis of -alkyl-benzo[d][1,2,3]triazole (TAz) requires at least 6 steps, and the acceptor unit of PBDB-T, benzo[1,2-b:4,5-c′ The synthesis of ]dithiophene-4,8-dione (BDD) also needs 6 steps. Obviously, this lengthy synthesis process is very different from the low-cost characteristics of organic solar cells, which is not conducive to the large-scale production and application of organic solar cells.

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