| 초록 |
Additive engineering has been widely used to improve the organic solar cells (OSCs) efficiency by controlling their nanostructure. However, most additive engineering has a limitation because it highly dependent on the characteristics of each donor and acceptor, and kinetically controls complex bulk heterojunction(BHJ) morphology. In addition, little research on energy loss has been conducted in solid additive processing. Here, we introduce newly synthesized solid star-shaped additives, These additives are delicately designed to achieve adequate energy level, electrostatic potential (ESP) and geometrical structure. Star-series additives improve morphology by enhancing the compatibility with only 1% addition, inducing large domains into tiny robust intermolecular aggregation for efficient charge transfer. In particular, Star-A reduces energy loss (ΔEloss ＜ 0.56) by suppressing nonradioactive recombination and improving the fill factor (FF), resulting in a 16.3% of PCE. |
