A kind of a-d-d′-a type asymmetric organic photovoltaic acceptor material and its application

Abstract

The invention belongs to the technical field of organic photovoltaics, in particular to a class of A-D-D'-A type asymmetric organic photovoltaic acceptor materials and applications thereof. Alkoxyindenothiophene and cyclopentadienodithiophene double-electron donor (D-D') units are used to jointly construct a skeleton containing non-covalent bond configuration locks, and 3-( Dicyanomethylene)inden-1-one modifies its terminus. Acceptors containing only simple fused rings have many advantages such as coplanar framework, low energy disorder and J-aggregation tendency, and the optical bandgap of such asymmetric small molecule acceptors is controllable in the range of 1.30-1.45eV tuned, can be combined with most donor materials to construct efficient bulk heterojunction binary organic solar cells. When the donor material is polymer PM6, the energy conversion efficiency of the binary OSCs device is as high as 13.67%, the open circuit voltage is 0.85eV, E loss Only 0.50V.

Description

A class of A-D-D'-A type asymmetric organic photovoltaic acceptor materials and their applications technical field The invention belongs to the technical field of organic photovoltaics, be specifically related to a class of structure is simple, based on A-D-D'-A type asymmetrical Organic photovoltaic acceptor materials and their applications in organic solar cells. Background technique [0002] The development of simple fused ring-like small molecule acceptor materials (number of fused rings ≤ 3) in organic solar cells obviously lags behind Large condensed ring type small molecule acceptor material (the number of condensed rings>3). Most reports of such materials are A‑D‑C‑D‑A with symmetric structure type small molecules, in which the D unit is mainly dithienocyclopentadiene (DTC). So far, based on such acceptor materials and The binary solar cell device efficiency when mixed with polymer donors such as PBDB‑T, PM6 or J52 is typically 10‑14%. But due to Compou...

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Problems solved by technology

[0004] Aiming at the low energy conversion efficiency and E loss Larger and other key issues, the present invention provides a class of A-D-D'-A type asymmetric small molecule acceptor materials with simple structure

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