| 초록 |
We design and synthesize small molecules and investigate their photovoltaic characteristics by using the small molecules in organic photovoltaics (OPVs). We introduce different cores to modulate the conjugation lengths of the small molecules and the bulk heterojunction (BHJ) morphologies. Three small-molecule donors are made, namely Ph-TTR, Na-TTR, and An-TTR, as conjugated cores. These donors were synthesized in a few steps and exhibited favorable BHJ morphologies, thereby giving promising power conversion efficiencies (PCEs). Of the three donors, Na-TTR showed the most efficient charge carrier generation and favorable molecular packing structures; and hence of the three types of devices tested, the Na-TTR:PC71BM devices exhibited the highest PCE, specifically 6.27%, without pre- or post-treatments. |
