Effect of Solvent-Assisted Nanoscaled Organo-Gels on Morphology and Performance of Organic Solar Cells

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• 作者：Li-Jian Zuo ; Xiao-Lian Hu ; Tao Ye ; Thomas R. Andersen ; Han-Ying Li ; Min-Min Shi ; Mingsheng Xu ; Jun Ling ; Qiang Zheng ; Jun-Ting Xu ; Eva Bundgaard ; Frederik C. Krebs ; Hong-Zheng Chen
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：August 16, 2012
• 年：2012
• 卷：116
• 期：32
• 页码：16893-16900
• 全文大小：530K
• 年卷期：v.116,no.32(August 16, 2012)
• ISSN：1932-7455

文摘

This paper reports how the morphology of a polymer鈥揻ullerene 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.