Phase Separation of P3HT/PMMA Blend Film for Forming Semiconducting and Dielectric Layers in Organic Thin-Film Transistors for High-Sensitivity NO2 Detection,ACS Applied Materials & Interfaces

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Phase Separation of P3HT/PMMA Blend Film for Forming Semiconducting and Dielectric Layers in Organic Thin-Film Transistors for High-Sensitivity NO2 Detection
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-11-13 , DOI: 10.1021/acsami.9b15651
Sihui Hou ₁ , Junsheng Yu ₁ , Xinming Zhuang ₁ , Dengfeng Li , Yiming Liu , Zhan Gao , Tianying Sun , Feng Wang , Xinge Yu

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Formation of the semiconductor/dielectric double-layered films via vertical phase separations from polymer blends is an effective method to fabricate organic thin-film transistors (OTFTs). Here, we introduce a simple one-step processing method for the vertical phase separation of poly(3-hexylthiophene-2,5-diyl) (P3HT) and poly(methyl methacrylate) (PMMA) blends in OTFTs and their applications for high-performance nitrogen dioxide (NO₂) sensors. Compared to the conventional two-step coated OTFT sensors, one-step processed devices exhibit a great enhancement of the responsivity from 116 to 1481% for 30 ppm NO₂ concentration and a limit of detection of ∼0.7 ppb. Studies of the microstructures of the blend films and the electrical properties of the sensors reveal that the devices formed by the one-step vertical phase separation have better capability for the adsorption of NO₂ molecules. Moreover, a careful adjustment of the blend ratio between P3HT and PMMA can further improve the performance of the NO₂ sensors, ranging from sensitivity to selectivity and to the ability of recovery. This simple one-step processing method demonstrates a potential possibility for developing high-performance, low-cost, and large-area OTFT gas sensors.

中文翻译：

P3HT / PMMA共混膜的相分离，用于在有机薄膜晶体管中形成半导体层和介电层，用于高灵敏度NO ₂检测

经由与聚合物共混物的垂直相分离形成半导体/介电双层膜是制造有机薄膜晶体管（OTFT）的有效方法。在这里，我们介绍了一种简单的一步法用于OTFT中的聚（3-己基噻吩-2,5-二基）（P3HT）和聚（甲基丙烯酸甲酯）（PMMA）共混物的垂直相分离及其在高TFT中的应用性能二氧化氮（NO ₂）传感器。与传统的两步涂覆OTFT传感器相比，一步处理的设备对30 ppm NO ₂的响应度从116％大幅提高到1481％浓度约为0.7 ppb。对共混膜的微观结构和传感器电学性能的研究表明，由一步式垂直相分离形成的装置具有更好的NO ₂分子吸附能力。此外，仔细调节P3HT和PMMA之间的混合比例可以进一步提高NO ₂传感器的性能，从灵敏度到选择性到回收能力。这种简单的一步处理方法证明了开发高性能，低成本和大面积OTFT气体传感器的潜在可能性。

更新日期：2019-11-14

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