Solution-crystallized n-type organic thin-film transistors: An impact of branched alkyl chain on high electron mobility and thermal durability
Solution-crystallized n-type organic thin-film transistors: An impact of branched alkyl chain on high electron mobility and thermal durability
复制标题
溶液结晶n型有机薄膜晶体管：支化烷基链对高电子迁移率和热耐久性的影响
DOI：
10.1016/j.orgel.2018.06.029
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发表时间：
2018
影响因子：
3.2
通讯作者：
Takeya Junichi
中科院分区：
文献类型：
--
作者：
Kumagai Shohei;Nakano Masahiro;Takimiya Kazuo;Takeya Junichi
单晶有机薄膜场效应晶体管（OTFT）被认为是小分子有机材料中载流子输运现象的理想平台，因此得到了积极的研究。此外，最近开发的基于溶液的技术来生长单晶薄膜已经吸引了基础物理学之外的工业关注。在这项工作中，一个基于溶液的技术，即，边缘铸造方法，被用来研究单晶OTFT的n型有机半导体，二聚萘并[2，3-B]噻吩二酰亚胺，与线性和支化的烷基链。在支链烷基衍生物中观察到>1 cm 2 V − 1 s − 1的高电子迁移率和优异的热耐久性，而基于直链烷基取代的OTFT在热退火后显示出明显的迁移率降低。因此，这项工作将证明支链烷基链的潜在可用性，以提高载体的流动性和热耐久性与大规模的印刷方法。
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 cm2V−1s−1and 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.