| 초록 |
Structural control of solubilizing side groups in fullerene–based electron acceptors is critically important to optimize their performance in bulk heterojunction (BHJ)–type polymer solar cell (PSC) devices. Herein, we synthesized a series of o–xylenyl C60 bis–adduct (OXCBA) derivatives with different solubilizing side groups to systematically investigate the effects of fullerenederivative structures on the photovoltaic properties of PSCs. End group modifications of OXCBA dramatically affect photovoltaic performance in blend films with poly(3–hexylthiophene) (P3HT), resulting in power conversion efficiencies (PCEs) ranging from 1.7 to 5.3%. We found that this large range in PCE values is mainly due to differences in the blend morphology and interfacial area of the P3HT:OXCBA derivative films caused by changes in the hydrophobicity of the OXCBA derivatives and their interfacial interaction with P3HT. |
