Microstructure and Optoelectronic Properties of P3HT-b-P4VP/PCBM Blends: Impact of PCBM on the Copolymer Self-Assembly

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• 作者：V茅ronique Gernigon ; Patrick L茅v锚que ; Fanny Richard ; Nicolas Leclerc ; Cyril Brochon ; Christoph H. Braun ; Sabine Ludwigs ; Denis V. Anokhin ; Dimitri A. Ivanov ; Georges Hadziioannou ; Thomas Heiser
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：November 26, 2013
• 年：2013
• 卷：46
• 期：22
• 页码：8824-8831
• 全文大小：477K
• 年卷期：v.46,no.22(November 26, 2013)
• ISSN：1520-5835

文摘

Block copolymers have been widely investigated over the past decades for their ability to microphase separate into well-defined nanostructured thin films with tailored physical properties. The aim of the present study is to investigate the thin film properties of rod鈥揷oil block copolymer/phenyl-C₆₁-butyric acid methyl ester (PCBM) blends as a function of the blend weight ratio, using a copolymer which is based on a poly(3-hexylthiophene) (P3HT) rod block and poly(4-vinylpyridine) (P4VP) coil block. Atomic force microscopy, transmission electron microscopy and grazing incidence X-ray diffraction analysis are used to study the influence of PCBM on the copolymer self-assembling. UV鈥搗isible absorption and photoluminescence spectroscopies as well as field-effect mobility measurements are performed in order to get further insight into the blend optoelectronic properties. It is found that the block copolymer phase-separated morphology and charge carrier mobilities strongly depend on the PCBM loading and thermal annealing. In particular, the results point out that PCBM enhances the block copolymer microphase separation within a narrow range of the polymer:PCBM weight ratio. In addition, clear evidence for PCBM accumulation within the P4VP domains is found by monitoring the P3HT fluorescence and charge carrier mobilities.