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Solution-crystallized n-type organic thin-film transistors: An impact of branched alkyl chain on high electron mobility and thermal durability
Organic Electronics ( IF 3.2 ) Pub Date : 2018-06-21 , DOI: 10.1016/j.orgel.2018.06.029
Shohei Kumagai , Masahiro Nakano , Kazuo Takimiya , Jun Takeya

Single-crystal organic thin-film field-effect transistors (OTFTs) have been actively studied because they are regarded as an ideal platform for charge carrier transport phenomena in small-molecule organic materials. Moreover, recently developed solution-based techniques to grow single-crystalline thin films have attracted industrial attention beyond fundamental physics. In this work, one of the solution-based techniques, namely, the edgecasting method, was employed to study single-crystal OTFTs of n-type organic semiconductors, dimerized naphtho[2,3-b]thiophene diimides, with linear and branched alkyl chains. A high electron mobility of >1 cm2 V−1 s−1 and an excellent thermal durability were observed in the branched alkyl-chain derivative, while the OTFT based on linear alkyl-substituted one showed clear degradation of mobility after thermal annealing. Therefore, this work will demonstrate a potential availability of branched alkyl chains for improving carrier mobility and thermal durability with large-scalable printing methods.



中文翻译:

溶液结晶的n型有机薄膜晶体管:支链烷基链对高电子迁移率和热耐久性的影响

单晶有机薄膜场效应晶体管(OTFT)已被积极研究,因为它们被认为是小分子有机材料中载流子传输现象的理想平台。此外,最近开发的基于解决方案的技术来生长单晶薄膜已经引起了除基础物理学以外的工业关注。在这项工作中,采用一种基于溶液的技术,即边缘浇铸法,来研究n型有机半导体的单晶OTFT ,即具有直链和支链烷基的二聚萘并[2,3- b ]噻吩二酰亚胺链。> 1 cm 2  V -1  s -1的高电子迁移率在支链烷基链衍生物中观察到具有优异的热耐久性,而基于线性烷基取代的OTFT在热退火后显示出明显的迁移率降低。因此,这项工作将证明在可大规模印刷的方法中,支链烷基链具有潜在的可用性,可用于改善载流子迁移率和热耐久性。

更新日期:2018-06-21
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