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

Li-Jian Zuo, Xiao-Lian Hu, Tao Ye, Thomas Rieks Andersen, Han-Ying Li, Min-Min Shi, Mingsheng Xu, Jun Ling, Qiang Zheng, Jun-Ting Xu, Eva Bundgaard, Frederik C Krebs, Hong-Zheng Chen

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Abstract

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.
Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume116
Issue number32
Pages (from-to)16893-16900
ISSN1932-7447
DOIs
Publication statusPublished - 2012

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