Mobility enhancement of DNTT and BTBT derivative organic thin-film transistors by triptycene molecule modification
Mobility enhancement of DNTT and BTBT derivative organic thin-film transistors by triptycene molecule modification
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DOI：
10.1016/j.orgel.2021.106219
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发表时间：
2021-09
影响因子：
3.2
通讯作者：
Masahiro Sugiyama;Sophie Jancke;T. Uemura;M. Kondo;Yumi Inoue;N. Namba;T. Araki;T. Fukushima;T. Sekitani
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文献类型：
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作者：
Masahiro Sugiyama;Sophie Jancke;T. Uemura;M. Kondo;Yumi Inoue;N. Namba;T. Araki;T. Fukushima;T. Sekitani
用一种特殊的三蝶烯分子进行界面修饰，自发地形成高度均匀的分子层，是一种很有前途的实现高性能柔性有机薄膜晶体管（OTFT）的技术。先前的研究已经表明，三蝶烯改性的聚合物表面增强了小分子有机半导体（OSC）DNTT（二萘并[2，3-B：2′，3 ′-f]噻吩并[3，2-B]噻吩）的结晶度，从而提高了迁移率。然而，迄今为止，三蝶烯修饰对其他OSC的有效性尚未得到证实。在这里，我们报告了三蝶烯层对OTFT中四种不同的基于噻吩并苯的OSC（C10-DNTT、DPh-DNTT、C8-BTBT（[1]苯并噻吩并[3，2-B][1]苯并噻吩）和DPh-BTBT）的积极作用。无论OSC类型，三蝶烯改性的OTFT被发现，以提高场效应迁移率。对于C10-DNTT OTFT，获得了20倍的最大有效迁移率增强。此外，通过扫描电子显微镜的OSC的表面形貌的详细观察表明，OSC薄膜的晶粒尺寸可以增加时，进行三蝶烯改性。
Interface modification with a particular triptycene molecule that spontaneously forms a highly uniform molecule layer is a promising technique for realizing high-performance flexible organic thin-film transistors (OTFTs). Previous studies have shown that the triptycene-modified polymer surface enhances the crystallinity of the small-molecule organic semiconductor (OSC), DNTT (dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene), resulting in improved mobility. However, to date, the effectiveness of triptycene modification for the other OSCs has not been confirmed. Here, we report on the positive effect of triptycene layers on four different thienoacene-based OSCs (C10-DNTT, DPh-DNTT, C8-BTBT ([1]benzothieno[3,2-b][1]benzothiophene), and DPh-BTBT) in OTFTs. Regardless of the OSC type, triptycene-modified OTFTs are found to improve the field-effect mobility. A maximum effective mobility enhancement of 20-fold was obtained for C10-DNTT OTFTs. Furthermore, detailed observations of the surface morphology of the OSCs via scanning electron microscopy revealed that the crystal grain size of the OSC thin films can be increased when triptycene modification is conducted.