Abstract
Organic thin film transistors (OTFTs) are normally sensitive to ambient conditions and show performance degradation in air. On the contrary, the performance of flexible 2,7-dioctyl[1] benzothieno [3,2-b][1]benzothiophene (C8-BTBT) OTFTs using cross-linked polymer layer, poly(4-vinyl-phenol)-4,4′-(hexafluoroisopropylidene) diphthalic anhydride (PVP-HDA), as the dielectric layer can be improved in air conditions with 40% relative humidity. Under soaking in air with 40% relative humidity, the electrical behavior, surface morphology, and contact angle of the flexible C8-BTBT OTFTs using PVP-HAD as dielectric layer with three different thicknesses were investigated. It is found that, when the devices with 375 nm-thick PVP-HDA films are placed in 40% relative humidity air conditions for 6 h, the corrected average mobility (μ) can increase from 3.2 to 5.1 cm2 V−1 s−1. Furthermore, the average threshold voltage (Vth) changes from −12.4 to −9.3 V while keeping a constant ratio of Ion/Ioff = 104. These results indicate that the flexible C8-BTBT OTFTs with PVP-HDA dielectric layer exhibit interesting application prospects.
摘要
有机薄膜晶体管(OTFTs)通常对环境条件敏感, 在空气中暴 露时其性能往往会出现退化. 本文分析了基于聚(4-乙基苯酚)-4,4′-(六氟异丙烯)二酞酸酐交联物绝缘层(PVP-HDA)的2,7-二辛基[1] 苯并噻吩[3,2-b][1]苯并噻吩(C8-BTBT)柔性OTFTs在40%相对湿 度的空气环境中暴露不同时间对器件性能的影响. 研究发现, PVPHDA 绝缘层材料在短时间40%相对湿度的空气下吸附空气中的水 分后, 器件的性能有所提升. 其中, 基于375 nm PVP-HAD绝缘层薄 膜的柔性OTFTs在相对湿度为40%的空气中放置6小时后, 校正后 的平均迁移率(μ)由3.2 cm2 V−1 s−1提高到5.1 cm2 V−1 s−1, 平均阈值 电压(Vth)由−12.4 V降低到−9.3 V, 开关比仍保持在104. 结果表明, 此类OTFT器件有望能够在空气环境中进行大面积制备, 并展现出 良好的应用前景.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2017YFA0206600) and the National Natural Science Foundation of China (51673214).
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Xie P and Liu T performed the experiments. Xie P, Liu T, Sun J and Yang J prepared the manuscript. Xie P, Sun J, He P, Dai G, Jiang J and Yang J participated in the discussion on experimental results. Yang J directed this project.
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The authors declare no conflict of interest.
Pengshan Xie received his BSc degree from the Central South University in 2017. Currently, he is a graduate student at the Central South University. His research interests are focused on the functional layers of high-performance organic thin-film transistors.
Tianjiao Liu received her BSc degree from Hunan Normal University in 2016. She received her MSc degree from the Central South University in 2019. Her research interest focuses on high-performance organic thin-film transistors.
Jia Sun received his PhD degree from Hunan University in 2012. He was a postdoctoral researcher in the Central South University (2012-2014) and Sungkyunkwan University (2017-2018). In 2014, he joined the faculty of Central South University. Now he is a professor in the School of Physics and Electronics. His research interests focus on novel photoelectronic devices and neuromorphic devices.
Junliang Yang received his PhD degree in 2008 from Changchun Institute of Applied Chemistry Chinese (CIAC), Chinese Academy of Sciences (CAS). He then joined Prof. Tim S. Jones’s group at the University of Warwick. In April 2011, he moved to the University of Melbourne and the Commonwealth Scientific and Industrial Research Organisation (CSIRO). In 2012, he was appointed as a professor of the School of Physics and Electronics, Central South University. His research focuses on flexible and printed electronics, organic and perovskite solar cells.
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The effect of air exposure on device performance of flexible C8-BTBT organic thin-film transistors with hygroscopic insulators
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Xie, P., Liu, T., He, P. et al. The effect of air exposure on device performance of flexible C8-BTBT organic thin-film transistors with hygroscopic insulators. Sci. China Mater. 63, 2551–2559 (2020). https://doi.org/10.1007/s40843-020-1489-6
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DOI: https://doi.org/10.1007/s40843-020-1489-6