| 초록 |
A ternary strategy has been demonstrated as a promising method to further improve the performance of organic solar cells (OSCs). Herein, an efficient polymer SiCl-BDT was incorporated into a host binary PM7:Y7 system to fabricate ternary OSCs. SiCl-BDT possesses good complementary absorption and good compatibility with PM7. Also, the lowest unoccupied molecular orbital (LUMO) cascade energy level of SiCl-BDT is slightly lower than that of PM7, which enables efficient exciton generation and charge transfer in ternary OSCs compared with that of PM7:Y7, leading to higher efficiency. The optimized ternary devices with 15 wt% SiCl-BDT in the donors achieve a PCE of 17.09%. Besides, we found that the photovoltaic device performance of ternary OSCs can be further established to an impressive efficiency of 17.40% by employing a highly effective interface strategy. Thus, our newly advanced method guarantees highly efficient and stable ternary OSCs. |
