초록 |
A series of small molecules that contained identical p-spacers,a central DPP unit,and different aromatic electron-donating end-groups were synthesized and used in organic solar cells to study the effect of electrondonating groups on the device performance. DPP-A-An, which contained anthracene end-groups, demonstrated a stronger absorbance and a higher hole mobility than DPP-A-Ph, which contained phenyl groups, and DPP-A-Na, which contained naphthalene units.The power-conversion efficiencies of OSCs based on organic:PC71BM blends with a processed DIO additive were 3.93% for DPP-A-An, 3.02% for DPP-Na, and 2.26% for DPP-A-Ph. These findings suggest that a DPP core that is functionalized with electron-donating capping groups constitutes a promising new class of solution-processable small molecules for OSC applications. |