摘要
This paper reports how the morphology of a polymer-fullerene derivative blend is tuned via the different aggregate states of the polymer in solutions. Based on a copolymer with benzodiothiophene and thiophene-3-carboxylate as alternating units (PBDTCT), we explored the polymer aggregation (i.e., organo-gels) behavior as a function of steric hindrance of aromatic solvents imposed by substituents. We showed that the size of organo-gels decreased as the substituents of solvents got larger. Also, the phase separation and domain size of the subsequent spin-coated films increased monotonically with that of the organo-gels in solution. Through this knowledge, we eventually achieve controlled morphology and optimized organic solar cells (OSCs) performance. Our results present a significant step forward for understanding the self-assembly behavior of conjugated polymers, control of their morphology and optimization of OSC performance.
源语言 | 英语 |
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页(从-至) | 16893-16900 |
页数 | 8 |
期刊 | Journal of Physical Chemistry C |
卷 | 116 |
期 | 32 |
DOI | |
出版状态 | 已出版 - 16 8月 2012 |
已对外发布 | 是 |