A Phase Diagram of the P3HT:PCBM Organic Photovoltaic System: Implications for Device Processing and Performance

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• 作者：Paul E. Hopkinson ; Paul A. Staniec ; Andrew J. Pearson ; Alan D. F. Dunbar ; Tao Wang ; Anthony J. Ryan ; Richard A. L. Jones ; David G. Lidzey ; Athene M. Donald
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：April 26, 2011
• 年：2011
• 卷：44
• 期：8
• 页码：2908-2917
• 全文大小：1094K
• 年卷期：v.44,no.8(April 26, 2011)
• ISSN：1520-5835

文摘

This paper describes the construction of a phase diagram for the as-cast state in the organic photovoltaic system P3HT:PCBM. Evidence for a transition to a phase-separated state at PCBM concentrations greater than 70 wt % is seen both by DMTA and GIWAXS, and the glass transition temperatures of blends in the single phase state below 70 wt % PCBM are observed to be raised compared to the pure polymer. Pure PCBM is observed to exhibit a thermal transition at 155 掳C, an observation unreported to date鈥攐ffering insight into crystallites commonly seen in device films. The liquid-crystal phase of P3HT is shown to persist in the presence of up to 41 wt % PCBM. In addition, pure PCBM is shown to be significantly hygroscopic, with important implications for the processing of high-performance devices.