Tuning crystal polymorphs of a π-extended tetrathiafulvalene-based cruciform molecule towards high-performance organic field-effect transistors  

通过晶相调控实现高性能十字形TTF分子场效应晶体管器件构筑

作　　者：Linlin Feng1 冯琳琳;董焕丽;李清源;朱伟刚;仇格格;丁尚;李旸;Mikkel A.Christensen;Christian R.Parker;魏钟鸣;Mogens Brondsted Nielsen;胡文平

机构地区：[1]Beijing Key Laboratory for Optical Materials and Photonic Devices,Department of Chemistry,Capital Normal University [2]Beijing National Laboratory for Molecular Sciences,Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences [3]Department of Chemistry,University of Copenhagen [4]State Key Laboratory of Superlattices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences [5]Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,School of Sciences,Tianjin University,&Collaborative Innovation Center of Chemical Science and Engineering

出　　处：《Science China Materials》2017年第1期75-82,共8页中国科学（材料科学（英文版）

基　　金：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);the University of Copenhagen

摘　　要：It is a common phenomenon for organic semi- conductors 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 molec- ular 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 con- trolling the growth of a-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 a-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.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.

关 键 词：organic semiconductor crystal polymorphs tetrathiafulvalene-based cruciform molecule field-effect transistor charge carrier mobility 

分 类 号：TN386[电子电信—物理电子学]