| 초록 |
Here, we introduced the novel BDT-based small molecules, BDTID-X, for determining the intermolecular effect by replacing halogen atoms (i.e., F, Cl, Br). The halogenated end group in 4-position of the 1H-indene-1,3(2H)dione (ID) showed the different morphological behavior in the BDTID-X:PC71BM blends. The Cl substitution exhibited high coplanarity of the backbone and strong dipole moment, facilitating better intermolecular interaction and charge transports. The BDTID-Cl device performed the highest FF of 78.0% compared to other devices with optimized morphology. As a results, the BDTID-Cl achieved a PCE of 10.5% and 15.1% in single and two-terminal monolithic tandem solar cells, respectively. |
