ИСТИНА

Organic photovoltaics is an intensively developing area. Organic solar cells (OSCs) have received a lot of attention due to the potential for the production of lightweight and inexpensive flexible solar cells1. Already comparable to inorganic solar cell representatives, the high power conversion efficiency (PCE) reaches over 19% in non-fullerene bulk heterojunction (BHJ) photovoltaic devices 2,3. This progress is largely due to the use of a new generation of acceptor materials - non-fullerene acceptors (NFA). The most effective NFA are conjugated compounds of donor-acceptor structure with a central condensed electron-donor fragment and terminal strong electron-withdrawing groups 1,4. This work presents the synthesis of novel non-fullerene acceptor molecules, which are conjugated compounds of donor-acceptor structure with a central condensed electron-donor fragment and end strong electron- acceptor groups 5,6. These compounds have a simpler structure and synthetic route compared to the known Y6. The chemical structure of the compounds were proved by 1H NMR, 13C NMR analysis. The compounds are characterized by a high thermal and photo stability, efficient sunlight absorption in the red and near-infrared spectral ranges. The photovoltaic properties of the new acceptors in mixture with the known commercially available donor PM6 were also investigated and showed some interesting results. This work was supported by the Russian Science Foundation (grant № 21-43-00051).