Siloxane group-containing A-DA 'D-A type conjugated organic small molecule as well as preparation method and application thereof

Abstract

The invention discloses a siloxane group-containing A-DA 'D-A type conjugated organic small molecule and a preparation method and application thereof, a diazosulfide unit is taken as a center, a pyrrole ring and two thiophenes are connected in parallel outwards to form a seven-membered fused ring structure which is taken as a molecular core, siloxane is used for blocking a side chain of a pyrrole ring nitrogen atom, and the siloxane group-containing A-DA' D-A type conjugated organic small molecule is obtained. And a series of siloxane group-containing A-DA 'D-A type conjugated organic small molecules are designed and synthesized by changing different acceptor units. The molecules have the advantages of strong light absorption capability, high mobility and proper electron energy level, and can be used as electron acceptor materials for preparing organic solar cells. The siloxane-terminated side chain of the organic small molecule prepared by the invention has a plurality of far-branched Si-O hybrid chains, so that the steric hindrance of the molecule can be effectively reduced, the interaction among the molecules is increased, the pi-pi stacking distance is reduced, and meanwhile, the molecule shows good solubility in a halogen-free solvent; and the halogen-free solvent and printing technology processing of the high-performance organic solar cell can be realized.

Description

technical field

[0001] The invention relates to the fields of chemical synthesis and organic photovoltaic materials, in particular to a siloxane group-containing A-DA'D-A type conjugated organic small molecule and a preparation method and application thereof. Background technique

[0002] Solution-processable organic solar cells are a green energy technology with unique advantages such as low cost, light weight, and the ability to fabricate large-area devices (X.Guo, Q.Fan and et al.Nat.Commun., 2020, 11, 4612; S. Park, T. Kim and et al. Adv. Mater., 2020, 32, 2002217; H. Chen, R. Zhang and et al. Nat. Energy, 2021, 6, 1045.). In 2019, Yingping Zou's research group reported a star small molecule-Y6 with A-DA'D-A structure, which has a wide absorption range, high absorption coefficient, unique and effective charge transport and exciton delocalization. 3D network. PM6:Y6-based PSCs achieved an astonishing PCE as high as 15.7% when Y6 was matched with the narrow-bandgap polym...

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