| 초록 |
Single-junction PSCs based on the PM6 copolymer show good photovoltaic performance in single junction PSCs only when treated with a halogenated solvent. However, PM6 copolymer-based PSCs processed with nonhalogenated solvents exhibit relatively low PCE due to undesirable morphological properties. Recently, terpolymers consisting of three different monomers in the polymer backbone have emerged as promising p-type polymers. The incorporation of a third monomer into a copolymer backbone can create numerous combinations that may have a synergetic effect on physicochemical properties. Herein, we synthesized a novel series of 1D/2A terpolymers (PBTPBD) with different ratio of benzo[1,2-b:4,5-b‘] dithiophene-4,8-dione, and thieno[3,4-c]pyrrole-4,6(5H)-dione. PBTPBD-50:IT-4F PSC, processed with o-xylene, exhibited a high PCE of 13.64%, which is 13% higher than that of PM6:IT-4F PSCs. Furthermore, the PBTPBD-50:IT-4F PSC maintained 82% of the initial PCE even after 204 days at 85℃. |
