Effect of Molecular Packing on Field-Effect Performance of Single Crystals of Thienyl-Substituted Pyrenes
Effect of Molecular Packing on Field-Effect Performance of Single Crystals of Thienyl-Substituted Pyrenes
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DOI：
10.1021/cm703499q
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发表时间：
2008-06
影响因子：
8.6
通讯作者：
M. Ashizawa;Koichi M. T. Yamada;A. Fukaya;R. Kato;K. Hara;J. Takeya
中科院分区：
文献类型：
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作者：
M. Ashizawa;Koichi M. T. Yamada;A. Fukaya;R. Kato;K. Hara;J. Takeya
采用Suzuki偶联反应制备了一系列含噻吩1−3的芘衍生物。溶液重结晶法和物理气相输运法（PVT）可得到1种不同类型的晶体。从2的异构体混合物中，1,8-异构体优选地从溶液中结晶，而1,6-异构体晶体则通过PVT方法得到。我们制作了上述化合物的单晶场效应晶体管，直接比较了1的两种异构体和2的两种异构体器件的场效应性能。虽然计算得到的重叠积分仅为~ 10−3，但对于1的单晶，最佳空穴迁移率达到0.02 cm2 V−1 s−1。有趣的是，对于1和2，只有一种类型的晶体表现出场效应特征，这表明即使在低耦合分子之间没有带输运的情况下，分子堆积也具有重要意义。估算了ea的分子间重叠积分。
A series of pyrene derivatives containing thienyl groups, 1−3, has been prepared using the Suzuki coupling reaction. Recrystallization from solution and physical vapor transport (PVT) method afforded different types of crystals of 1. From the mixture of isomers of 2, the 1,8-isomer preferably crystallized from solution, whereas the 1,6-isomer crystal was obtained by the PVT method. Fabricating single-crystal-based field-effect transistors of the above compounds we directly compared the field-effect performance between the devices of the two isoforms of 1 and those of the two isomers of 2. Though the overlap integrals were calculated to be only ∼10−3, the best hole mobility reached 0.02 cm2 V−1 s−1 for one of the single crystals of 1. Intriguingly, for both 1 and 2 only one type of the crystal shows the field-effect characteristics, indicating the significance of molecular packing even in the absence of band transport among the poorly coupled molecules. The estimated intermolecular overlap integrals for ea...