Side-Chain Tunability of Furan-Containing Low-Band-Gap Polymers Provides Control of Structural Order in Efficient Solar Cells

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• 作者：Alan T. Yiu ; Pierre M. Beaujuge ; Olivia P. Lee ; Claire H. Woo ; Michael F. Toney ; Jean M. J. Fr茅chet
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：February 1, 2012
• 年：2012
• 卷：134
• 期：4
• 页码：2180-2185
• 全文大小：383K
• 年卷期：v.134,no.4(February 1, 2012)
• ISSN：1520-5126

文摘

The solution-processability of conjugated polymers in organic solvents has classically been achieved by modulating the size and branching of alkyl substituents appended to the backbone. However, these substituents impact structural order and charge transport properties in thin-film devices. As a result, a trade-off must be found between material solubility and insulating alkyl content. It was recently shown that the substitution of furan for thiophene in the backbone of the polymer PDPP2FT significantly improves polymer solubility, allowing for the use of shorter branched side chains while maintaining high device efficiency. In this report, we use PDPP2FT to demonstrate that linear alkyl side chains can be used to promote thin-film nanostructural order. In particular, linear side chains are shown to shorten 蟺鈥撓€ stacking distances between backbones and increase the correlation lengths of both 蟺鈥撓€ stacking and lamellar spacing, leading to a substantial increase in the efficiency of bulk heterojunction solar cells.