ИСТИНА

Currently, organic photovoltaics, particularly organic solar cells (OSCs), are a subject of great interest to the global scientific community, as OSCs represent an environmentally friendly technology of renewable energy. The power conversion efficiency (PCE) of OSCs exceeds 19% , for devices based on fused ring non-fullerene electron acceptor materials (FREAs), which are complex polyaromatic compounds of the donor-acceptor type with a planar and rigid chemical structure. For less complex NFAs of non-fused ring structure (NFREAs) with bulk substituents in the structure that prevent conformational transitions of the molecule, the PCE achieves 17% . Notwithstanding the aforementioned successes, the most significant challenge to the commercialization of OSCs based on FREAs is the labor-intensive and multistep nature of their synthesis, which renders these materials prohibitively expensive. The realization of NFREAs is still hindered by the unresolved issues of stability, complementarity of donor materials for them, and structure-property-performance relationship of the device. Moreover, the utilization of NFAs that absorb within the NIR range of 750 to 1200 nm can markedly extend the absorption spectrum of the active layer and augment the photon collection capacity of OSCs, thereby enhancing efficiency. Consequently, the pursuit of structures with the requisite physicochemical attributes to develop high-efficiency OSCs is crucial and pertinent. This work presents the synthesis of new potential NFAs, which were developed and carried out. The chemical structure of the compounds were proved by 1H NMR, 13C NMR techniques and by MALDI mass spectrometry analysis. The compounds are characterized by a high thermal and photo stability, efficient sunlight absorption in the red and near-infrared spectral ranges, good solubility combined with a high degree of crystallinity and possess appropriate energy levels of HOMO and LUMO levels to be used for OSCs. The photovoltaic data of the novel NFAs in binary and ternary blends with commercially available donor material PM6 and acceptor material Y6 demonstrated PCE of more than 18% in prototype ternary OSCs, which is comparable to the record values in this field. The work was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation (FFSM-2024-0003).