Fluorination of Donor–Acceptor Copolymer Active Layers Enhances Charge Mobilities in Thin-Film Transistors,ACS Macro Letters

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Fluorination of Donor–Acceptor Copolymer Active Layers Enhances Charge Mobilities in Thin-Film Transistors
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-10-02 00:00:00 , DOI: 10.1021/acsmacrolett.7b00716
Brandon H Smith , Qianqian Zhang ₁ , Mary Allison Kelly ₁ , Joshua H Litofsky , Dinesh Kumar ₂ , Alexander Hexemer ₂ , Wei You ₁ , Enrique D Gomez

Affiliation

Several recent reports have demonstrated that fluorinated analogues of donor/acceptor copolymers surpass nonfluorinated counterparts in terms of performance in electronic devices. Using a copolymer series consisting of fluorinated, partially fluorinated, and nonfluorinated benzotriazole, we confirm that the addition of fluorine substituents beneficially impacts charge transport in polymer semiconductors. Transistor measurements demonstrated a factor of 5 increase in carrier mobilities with the degree of fluorination of the backbone. Furthermore, grazing-incidence X-ray diffraction data indicates progressively closer packing between the conjugated cores and an overall greater amount of π-stacking in the fluorinated materials. It is likely that attractive interactions between the electron-rich donor and fluorinated electron-deficient acceptor units induce very tightly stacking crystallites, which reduce the energetic barrier for charge hopping. In addition, a change in crystallite orientation was observed from primarily edge-on without fluorine substituents to mostly face-on with fluorinated benzotriazole.

中文翻译：

供体-受体共聚物活性层的氟化增强了薄膜晶体管中的电荷迁移率

最近的几份报告表明，供体/受体共聚物的氟化类似物在电子设备中的性能方面超过了非氟化对应物。使用由氟化、部分氟化和非氟化苯并三唑组成的共聚物系列，我们确认添加氟取代基有益地影响聚合物半导体中的电荷传输。晶体管测量表明，随着骨架的氟化程度，载流子迁移率增加了 5 倍。此外，掠入射 X 射线衍射数据表明共轭核之间的堆积越来越紧密，氟化材料中的 π 堆积量总体更大。富电子供体和氟化缺电子受体单元之间的有吸引力的相互作用可能会导致非常紧密堆叠的微晶，这降低了电荷跳跃的能量势垒。此外，观察到微晶取向的变化，从没有氟取代基的主要面向边缘到大部分面向氟化苯并三唑。

更新日期：2017-10-02

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