Influence of the Alkyl Substituents Spacing on the Solar Cell Performance of Benzodithiophene Semiconducting Polymers
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- 作者：Prakash Sista ; Bofei Xue ; Mitchell Wilson ; Natalie Holmes ; Ruvini S. Kularatne ; Hien Nguyen ; Paul C. Dastoor ; Warwick Belcher ; Katelyn Poole ; Benjamin G. Janesko ; Michael C. Biewer ; Mihaela C. Stefan
- 刊名：Macromolecules
- 出版年：2012
- 出版时间：January 24, 2012
- 年：2012
- 卷：45
- 期：2
- 页码：772-780
- 全文大小：487K
- 年卷期：v.45,no.2(January 24, 2012)
- ISSN：1520-5835
文摘
Three semiconducting polymers containing benzodithiophene with decylphenylethynyl substituents have been synthesized for which the spacing between alkyl substituents has been systematically increased by introduction of thiophene and bithiophene units in the backbone of the polymer. As the spacing between the side chains increased, an increase of the weight ratio of polymer to fullerene acceptor was required for achieving the highest power conversion efficiency of bulk heterojunction solar cells. The spacing between the side chains of the polymers was estimated from DFT calculations. The TMAFM analysis of polymer PCBM blends showed that the smooth films exhibited the highest solar cell performance.