Liquid crystals for organic thin-film transistors.
Liquid crystals for organic thin-film transistors.
复制标题
DOI：
10.1038/ncomms7828
复制
发表时间：
2015-04-10
影响因子：
16.6
通讯作者：
Hanna, Jun-ichi
中科院分区：
文献类型：
--
作者：
Iino, Hiroaki;Usui, Takayuki;Hanna, Jun-ichi
有机半导体的结晶薄膜是印刷电子领域场效应晶体管（FET）材料的良好候选材料。然而，目前存在两个主要问题，这与这些膜的不均匀性和差的热耐久性有关。在这里，我们报告，液晶材料表现出高度有序的液晶相的近晶E（SmE）可以解决这两个问题。我们设计并合成了一种用于场效应晶体管的SmE液晶材料2-癸基-7-苯基-[1]苯并噻吩并[3，2-B][1]苯并噻吩（Ph-BTBT-10），该材料在SmE前体薄膜晶化时可重复地提供均匀且分子平坦的多晶薄膜，并且在高达200 °C的温度下也表现出高的耐久性。此外，在120 °C下热退火后，底栅底接触FET的迁移率显著提高了约一个数量级（超过10 cm 2 V−1 s−1）。我们预计，在溶液处理FET中使用SmE液晶可能有助于克服印刷电子新技术即将面临的困难。 小分子的多晶薄膜由于其大的电荷迁移率而有望用于有机薄膜晶体管，但目前受到膜均匀性和热耐久性差的限制。在这里，Iino等人设计了一种有序液晶相来克服这两个问题。
Crystalline thin films of organic semiconductors are a good candidate for field effect transistor (FET) materials in printed electronics. However, there are currently two main problems, which are associated with inhomogeneity and poor thermal durability of these films. Here we report that liquid crystalline materials exhibiting a highly ordered liquid crystal phase of smectic E (SmE) can solve both these problems. We design a SmE liquid crystalline material, 2-decyl-7-phenyl-[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT-10), for FETs and synthesize it. This material provides uniform and molecularly flat polycrystalline thin films reproducibly when SmE precursor thin films are crystallized, and also exhibits high durability of films up to 200 °C. In addition, the mobility of FETs is dramatically enhanced by about one order of magnitude (over 10 cm2 V−1 s−1) after thermal annealing at 120 °C in bottom-gate-bottom-contact FETs. We anticipate the use of SmE liquid crystals in solution-processed FETs may help overcome upcoming difficulties with novel technologies for printed electronics. Polycrystalline thin films of small molecules hold promise for organic thin-film transistors because of their large charge mobility, but are currently limited by poor film homogeneity and thermal durability. Here, Iino et al. design an ordered liquid crystal phase to overcome these two problems.
登录
查看更多内容
影响因子：
8.6
作者：
Podzorov, V;Menard, E;Gershenson, ME
通讯作者：
Gershenson, ME
影响因子：
41.2
作者：
Mcculloch, I;Heeney, M;Toney, MF
通讯作者：
Toney, MF
影响因子：
3.2
作者：
Iino, Hiroaki;Hanna, Jun-ichi
通讯作者：
Hanna, Jun-ichi
影响因子：
15
作者：
van Breemen, AJJM;Herwig, PT;Meskers, SCJ
通讯作者：
Meskers, SCJ
影响因子：
2.3
作者：
Uemura, Takafumi;Hirose, Yuri;Takeya, Jun
通讯作者：
Takeya, Jun