An ADMET route to low-band-gap poly(3-hexadecylthienylene vinylene): A systematic study of molecular weight on photovoltaic performance

Joshua C. Speros, Bryan D. Paulsen, Scott P. White, Yanfei Wu, Elizabeth A. Jackson, Bradley S. Slowinski, C. Daniel Frisbie, Marc A. Hillmyer

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The effect of molecular weight on organic photovoltaic device performance is investigated for a series of low-band-gap (ca. 1.65 eV) poly(3- hexadecylthienylene vinylene)s (C16-PTVs) prepared by acyclic diene metathesis (ADMET) polymerization. By utilizing monomers of varying cis:trans (Z:E) content, seven C16-PTVs were prepared with a number-average molecular weight range of 6-30 kg/mol. Polymers were characterized by size-exclusion chromatography, 1H NMR spectroscopy, ultraviolet-visible spectroscopy, thermogravimetric analysis, wide-angle X-ray scattering, and differential scanning calorimetry. C16-PTVs were integrated into bulk-heterojunction (BHJ) solar cells with [6,6]-phenyl-C 61-butyric acid methyl ester (PCBM), and conversion efficiency was found to increase with increasing molecular weight. This observation is attributable to an increase in polymer aggregation in the solid state and a corresponding increase in hole mobility. Finally, phase behavior and morphology of the C16-PTV:PCBM active layers were investigated by differential scanning calorimetry and atomic force microscopy, respectively.

Original languageEnglish (US)
Pages (from-to)2190-2199
Number of pages10
JournalMacromolecules
Volume45
Issue number5
DOIs
StatePublished - Mar 13 2012

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