ИСТИНА

At present, the search for new charge-transport materials for perovskite solar cells (PSCs) is an important task. Recently, we have successfully synthesized a series of new conjugated oligomeric compounds with various electron-donor and electron-acceptor groups for evaluation as charge-transport materials in PSCs. Compounds SM1–SM8 and NFA-1 (Figure 1 a, b) were studied in p-i-n photovoltaic cells, with the highest efficiency of 14.2% observed when using bis-perylendiimide oligomer NFA-1 as the electron transporting layer. Figure 1 New conjugated polymers P1–P6 (Figure 1 c), containing only a single type of benzodithiophene fragments in the main conjugated chain, were obtained by Stille polymerization and were purified and fully characterized by standard methods. The HOMO energies of polymers turned out to be close to the energy level of the MAPbI3 perovskite valence band, which made it possible to test them as hole-transport materials in n-i-p solar cells. The maximum efficiency of 18.6% was observed for photocells with HTL based on polymer P2, which contains alternating of monoalkyl- and dialkyl-substituted thiophene fragments in the side chain. The study was supported by RSCF (project # 22-23-00318)