期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 20, 期 35, 页码 7398-7405出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm00666a
关键词
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资金
- National Research Foundation of Korea Grant (MEST) [NRF-2009-C1AAA001-20090093485]
Here, we report the preparation of well-controlled nanoscale morphologies in photoactive thin films. The fabrication of bulk heterojunction structures in blend films of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) employed two steps to achieve first the in situ formation of self-organized P3HT nanowires using a marginal solvent, and second, phase separation via mild thermal annealing. Morphological changes in the active layers that had been spin-cast from a marginal solvent, with varying annealing temperatures, were systematically studied and compared to the morphologies of films spin-cast from a good solvent. The interpenetrating nanowire structure yielded power conversion efficiencies as high as 4.07% due to the enhanced charge transport. Hole and electron mobilities increased substantially to 1.6 x 10(-3) cm(2) V(-1) s(-1) and 1.4 x 10(-3) cm(2) V(-1) s(-1), respectively, due to the two step process of P3HT crystallization by nanowire formation and subsequent phase separation. Photovoltaic performances improved with increasing film thickness up to 300 nm as a result of the interpenetrating donor/acceptor network structure.
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