Self-aligned capillarity-assisted printing of top-gate thin-film transistors on plastic
Self-aligned capillarity-assisted printing of top-gate thin-film transistors on plastic
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DOI：
10.1088/2058-8585/aad476
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发表时间：
2018-08
影响因子：
3.1
通讯作者：
W. J. Hyun;E. Secor;Fazel Zare Bidoky;S. B. Walker;J. Lewis;M. Hersam;L. Francis;C. Frisbie
中科院分区：
文献类型：
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作者：
W. J. Hyun;E. Secor;Fazel Zare Bidoky;S. B. Walker;J. Lewis;M. Hersam;L. Francis;C. Frisbie
顶栅薄膜晶体管 (TFT) 采用基于毛细管辅助光刻和喷墨印刷的自对准方法在塑料上制造，为柔性电子设备的高通量制造提供了一个有前途的平台。使用精密模具在塑料基材上压印包含毛细管通道和墨水接收器的多层结构。通过喷墨印刷将液体墨水依次输送到微结构基板上，毛细作用将墨水吸入专为顶栅 TFT 设计的多层毛细通道网络中。压印、喷墨印刷和毛细管流动的结合产生了自对准多层器件，而不需要喷墨印刷的精确配准。具有Ag/Cu源极和漏极、聚(3-己基噻吩)半导体沟道、离子凝胶电介质和石墨烯栅电极的印刷顶栅TFT具有理想的传输和输出特性，空穴迁移率为0.48 cm2 V−1 s−1，阈值电压为-0.86 V，开/关电流比为104.5，并且具有鲁棒的抗弯曲能力。顶栅几何结构和仔细的材料选择使器件的磁滞和扫描速率依赖性可以忽略不计，从而确立了这种自对准策略的多功能性和实用性，以便在印刷和柔性电子产品中得到更广泛的应用。
Top-gate thin-film transistors (TFTs) are fabricated on plastic using a self-aligned method based on capillarity-assisted lithography and inkjet printing, offering a promising platform for high-throughput manufacturing of flexible electronic devices. Plastic substrates are imprinted with a multi-tier structure containing capillary channels and ink receivers using a precision mold. Liquid inks are sequentially delivered to the microstructured substrate by inkjet printing, and capillary action draws the inks into a multi-tier capillary channel network designed for top-gate TFTs. The combination of imprinting, inkjet printing, and capillary flow yields self-aligned multi-layered devices without requiring precise registration for inkjet printing. The printed top-gate TFTs with Ag/Cu source and drain, poly(3-hexylthiophene) semiconducting channel, ion gel dielectric, and graphene gate electrode have desirable transfer and output characteristics, with a hole mobility of 0.48 cm2 V−1 s−1, threshold voltage of −0.86 V, on/off current ratio of 104.5, and robust tolerance to bending. The top-gate geometry and careful materials selection yields devices with negligible hysteresis and sweep rate dependence, establishing the versatility and utility of this self-aligned strategy for more widespread application in printed and flexible electronics.