Bar‐Coated Organic Thin‐Film Transistors with Reliable Electron Mobility Approaching 10 cm2 V−1 s−1,Advanced Electronic Materials

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Bar‐Coated Organic Thin‐Film Transistors with Reliable Electron Mobility Approaching 10 cm2 V−1 s−1
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2019-12-01 , DOI: 10.1002/aelm.201901002
Junhua Bai ₁ , Yu Jiang _{1,

2} , Zhongli Wang ₁ , Ying Sui ₁ , Yunfeng Deng ₁ , Yang Han ₁ , Yanhou Geng _{1,

2}

Affiliation

The realization of high‐performance n‐type organic thin‐film transistors (OTFTs) via solution processing remains challenging, while these devices are considered highly desirable as basic elements for organic circuits. Apart from the designing of semiconducting materials, the controlling of thin‐film microstructures using specific processing techniques is also effective to enhance OTFT performance. In this work, bar coating—a meniscus‐guided and high throughput production compatible technique—is utilized to orient a diketopyrrolopyrrole‐based conjugated polymer (P4FTVT‐C32) for uniaxially aligned thin film with large crystalline grains, assisted by polyethylenimine ethoxylated interlayer. The anisotropic molecular arrangement of the bar‐coated thin films is confirmed by X‐ray diffraction, atomic force microscopy, and polarized UV−vis absorption analyses. OTFTs based on the oriented thin films exhibit remarkable charge transport anisotropy. High saturation and linear mobility up to 9.38 and 8.35 cm² V⁻¹ s⁻¹ along with high on/off ratio of 10⁵–10⁶ is achieved when the electric field is parallel to the coating direction. These are the highest reliable electron mobilities obtained from solution‐processed OTFTs, considering their high reliability factor >80%. These results demonstrate that the electron mobility of conjugated polymers can be significantly improved by proper solution processing at optimized interfaces.

中文翻译：

具有可靠电子迁移率的棒涂有机薄膜晶体管，其电导率接近10 cm2 V-1 s-1

通过溶液处理实现高性能n型有机薄膜晶体管（OTFT）仍然具有挑战性，而这些器件被认为是有机电路的基本元件。除了半导体材料的设计之外，使用特定的加工技术控制薄膜微结构对于提高OTFT性能也有效。在这项工作中，棒材涂料（一种弯月面引导的，高通量的生产兼容技术）被用来定向以二酮吡咯并吡咯为基础的共轭聚合物（P4FTVT-C32），用于具有大晶粒的单轴取向薄膜，并辅以聚乙烯亚胺乙氧基化中间层。棒涂薄膜的各向异性分子排列通过X射线衍射，原子力显微镜，和偏振的紫外可见吸收分析。基于取向薄膜的OTFT表现出显着的电荷传输各向异性。高饱和度和线性迁移率，最大可达9.38和8.35 cm当电场平行于涂层方向时，可获得² V ^-1 s ^-1的高开/关比10 ⁵ –10 ⁶。考虑到它们的高可靠性系数> 80％，这是从溶液处理的OTFT中获得的最高的可靠电子迁移率。这些结果表明，通过在优化的界面上进行适当的溶液处理，可以显着提高共轭聚合物的电子迁移率。

更新日期：2020-01-13

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