Abstract: An asymmetric organic photovoltaic acceptor material in an A-D-D?-A type is provided. A backbone containing noncovalent conformational lock is co-constructed with alkoxyindenothiophene and cyclopentadithiophene two-electron donor (D-D?) unit, and the ends are modified with fluorine- and chlorine-atom-substituted 3-(dicyanomethylidene)inden-1-one. The acceptor containing only a simple condensed ring has multiple advantages such as a coplanar backbone, low energy disorder, and J-aggregation tendency, and this type of asymmetric small-molecule acceptor has a controllably adjustable optical bandgap in the range of 1.30-1.45 eV, which is capable of combining with most donor materials to construct highly efficient binary bulk heterojunction organic solar cell. When the donor material is polymer PM6, the photoelectric conversion efficiency of the binary organic solar cells (OSCs) device is as high as 13.67%, with an open-circuit voltage (Voc) of 0.85 eV and energy loss (Eloss) is only 0.50 V.

Abstract: An asymmetric organic photovoltaic acceptor material in an A-D-D?-A type is provided. A backbone containing noncovalent conformational lock is co-constructed with alkoxyindenothiophene and cyclopentadithiophene two-electron donor (D-D?) unit, and the ends are modified with fluorine- and chlorine-atom-substituted 3-(dicyanomethylidene)inden-1-one. The acceptor containing only a simple condensed ring has multiple advantages such as a coplanar backbone, low energy disorder, and J-aggregation tendency, and this type of asymmetric small-molecule acceptor has a controllably adjustable optical bandgap in the range of 1.30-1.45 eV, which is capable of combining with most donor materials to construct highly efficient binary bulk heterojunction organic solar cell. When the donor material is polymer PM6, the photoelectric conversion efficiency of the binary organic solar cells (OSCs) device is as high as 13.67%, with an open-circuit voltage (Voc) of 0.85 eV and energy loss (Eloss) is only 0.50 V.