Abstract
It is a common phenomenon for organic semiconductors to crystallize in two or more polymorphs, leading to various molecular packings and different charge transport properties. Therefore, it is a crucial issue of tuning molecular crystal polymorphs (i.e., adjusting the same molecule with different packing arrangements in solid state) towards efficient charge transport and high performance devices. Here, the choice of solvent had a marked effect on controlling the growth of α-phase ribbon and β-phase platelet during crystallization for an indenofluorene (IF) π-extended tetrathiafulvalene (TTF)-based cruciform molecule, named as IF-TTF. The charge carrier mobility of the α-phase IF-TTF crystals was more than one order of magnitude higher than that of β-phase crystals, suggesting the importance of reasonably tuning molecular packing in solid state for the improvement of charge transport in organic semiconductors.
摘要
有机分子溶剂的选择对于调控不同晶相来说有着关键性作用. 本文通过两种溶剂的调控, 成功得到茚并芴四硫富瓦烯(IF-TTF)两种不同的晶相—α相带状晶体和β相片状晶体, 并对两种晶相的内部分子排列堆积情况进行了一系列的对比分析. 结果表明场效应电荷传输能力随着晶相的不同而有所差异, 直接证明了分子堆积的合理调控对实现有机半导体材料高性能电荷传输性能的重要性.
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Acknowledgments
The work was supported by Beijing NOVA Programme (Z131101000413038), Beijing Local College Innovation Team Improve Plan (IDHT20140512), the National Natural Science Foundation of China (91433115, 91222203, 91233205 and 51222306), the Ministry of Science and Technology of China (2013CB933403 and 2013CB933504) and the University of Copenhagen.
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Linlin Feng obtained her BSc degree from Capital Normal University (CNU) in 2014 and now is a graduate student at the Department of Chemistry, CNU and majored in polymer chemistry and physics. Her research interest is in conjugated polymer materials and devices.
Huanli Dong received her PhD degree (2009) of physical chemistry from the Institute of Chemistry, Chinese Academy of Sciences (ICCAS). She is now a professor of the Key Laboratory of Organic Solids, ICCAS. She received the Outstanding Young Scientist Foundation of NSFC (2012), the Prize for Young Chemists of Chinese Chemical Society (2014). Her research interests include molecular materials, crystals and devices of organic/polymeric semiconductors, and currently she has published more than 110 peer-reviewed papers with citation over 3000 times.
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Tuning Crystal Polymorphs of a π-Extended Tetrathiafulvalene-based Cruciform Molecule towards High-Performance Organic Field-Effect Transistors
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Feng, L., Dong, H., Li, Q. et al. Tuning crystal polymorphs of a π-extended tetrathiafulvalene-based cruciform molecule towards high-performance organic field-effect transistors. Sci. China Mater. 60, 75–82 (2017). https://doi.org/10.1007/s40843-016-5137-4
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DOI: https://doi.org/10.1007/s40843-016-5137-4