An ADMET Route to Low-Band-Gap Poly(3-hexadecylthienylene vinylene): A Systematic Study of Molecular Weight on Photovoltaic Performance

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• 作者：Joshua C. Speros ; Bryan D. Paulsen ; Scott P. White ; Yanfei Wu ; Elizabeth A. Jackson ; Bradley S. Slowinski ; C. Daniel Frisbie ; Marc A. Hillmyer
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：March 13, 2012
• 年：2012
• 卷：45
• 期：5
• 页码：2190-2199
• 全文大小：706K
• 年卷期：v.45,no.5(March 13, 2012)
• ISSN：1520-5835

文摘

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鈥?0 kg/mol. Polymers were characterized by size-exclusion chromatography, ¹H NMR spectroscopy, ultraviolet鈥搗isible 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-C₆₁-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.