Thin dielectric-layer-enabled low-voltage operation of fully printed flexible carbon nanotube thin-film transistors
Thin dielectric-layer-enabled low-voltage operation of fully printed flexible carbon nanotube thin-film transistors
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DOI：
10.1088/1361-6528/ab703f
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发表时间：
2020-03-20
期刊：
影响因子：
3.5
通讯作者：
Kumar, Satish
中科院分区：
文献类型：
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作者：
Chen, Jialuo;Mishra, Saswat;Kumar, Satish
可印刷电介质层的质量已经成为实现高性能全印刷晶体管的主要障碍之一。厚的介电层将需要高的栅极电压来打开和关闭晶体管，这将导致印刷设备中的高功耗。为了应对这一挑战，已经使用气溶胶喷射印刷在诸如聚酰亚胺和液晶聚合物的柔性膜上制造了完全印刷的基于碳纳米管（CNT）的薄膜晶体管（TFT）。这些器件可以在低于10 V的偏置电压下工作（漏极/栅极电压约为6 V）。这比先前报道的完全印刷的CNT-TFT的值小得多，因为使用xdi-dcs（聚（乙烯基苯酚）/聚（甲基倍半硅氧烷）的混合物）作为电介质并且使用单一印刷方法。较低的电压是印刷的CNT网络中的薄介电层（类似于300 nm）和良好均匀性的结果。印刷的CNT-TFT显示开/关比>10（5），迁移率>5 cm（2）V（-1）s（-1）。CNT的逐层沉积允许高度均匀和致密的网络形成，并且使用天然丁醇的xdi-dcs浓度的优化提供了薄介电层的高产率印刷。总的来说，这项工作显示了在各种柔性电子应用中使用全印刷CNT-TFT的潜力，如可穿戴传感器，致动器，人造皮肤，显示器和无线标签和天线。
The quality of printable dielectric layer has become one of the major obstacles to achieving high-performance fully printed transistors. A thick dielectric layer will require high gate voltage to switch the transistors on and off, which will cause high power dissipation in printed devices. In response to this challenge, fully printed carbon nanotube (CNT)-based thin-film transistors (TFTs) have been fabricated on flexible membranes such as polyimide and liquid crystal polymer using aerosol jet printing. These devices can be operated at bias voltages below 10 V (drain/gate voltages around 6 V). This is much smaller than the previously reported values for fully printed CNT-TFTs because of using xdi-dcs (mixture of poly(vinylphenol)/poly (methylsilsesquioxane)) as the dielectric and using a single printing method. The lower voltage is a consequence of a thin dielectric layer (similar to 300 nm) and good uniformity in the printed CNT network. The printed CNT-TFTs show on/off ratio >10(5), and mobility >5 cm(2)V(-1)s(-1). Layer-by-layer deposition of CNT allows highly uniform and dense network formation, and the optimization of the xdi-dcs concentration using natural butyl alcohol provides high-yield printing of a thin dielectric layer. Collectively, this work shows the potential of using fully printed CNT-TFTs in various flexible electronic applications such as wearable sensors, actuators, artificial skin, displays and wireless tags and antennas.