Lee Wookyu, Koo Hyunmo, Sun Junfeng, Noh Jinsoo, Kwon Kye-Si, Yeom Chiseon, Choi Younchang, Chen Kevin, Javey Ali, Cho Gyoujin
Regional Innovation Center for Printed Electronics, Sunchon National University, Sunchon 540-742, Korea.
Department of Printed Electronics Engineering, Sunchon National University, Sunchon 540-742, Korea.
Sci Rep. 2015 Dec 4;5:17707. doi: 10.1038/srep17707.
Roll-to-roll (R2R) printing has been pursued as a commercially viable high-throughput technology to manufacture flexible, disposable, and inexpensive printed electronic devices. However, in recent years, pessimism has prevailed because of the barriers faced when attempting to fabricate and integrate thin film transistors (TFTs) using an R2R printing method. In this paper, we report 20 × 20 active matrices (AMs) based on single-walled carbon nanotubes (SWCNTs) with a resolution of 9.3 points per inch (ppi) resolution, obtained using a fully R2R gravure printing process. By using SWCNTs as the semiconducting layer and poly(ethylene terephthalate) (PET) as the substrate, we have obtained a device yield above 98%, and extracted the key scalability factors required for a feasible R2R gravure manufacturing process. Multi-touch sensor arrays were achieved by laminating a pressure sensitive rubber onto the SWCNT-TFT AM. This R2R gravure printing system overcomes the barriers associated with the registration accuracy of printing each layer and the variation of the threshold voltage (Vth). By overcoming these barriers, the R2R gravure printing method can be viable as an advanced manufacturing technology, thus enabling the high-throughput production of flexible, disposable, and human-interactive cutting-edge electronic devices based on SWCNT-TFT AMs.
卷对卷（R2R）印刷已被视作一种具有商业可行性的高通量技术，用于制造柔性、一次性且价格低廉的印刷电子设备。然而，近年来，由于尝试使用R2R印刷方法制造和集成薄膜晶体管（TFT）时面临诸多障碍，悲观情绪盛行。在本文中，我们报告了基于单壁碳纳米管（SWCNT）的20×20有源矩阵（AM），其分辨率为每英寸9.3点（ppi），是使用完全R2R凹版印刷工艺获得的。通过使用SWCNT作为半导体层并以聚对苯二甲酸乙二酯（PET）作为基板，我们获得了高于98%的器件成品率，并提取了可行的R2R凹版制造工艺所需的关键可扩展性因素。通过将压敏橡胶层压到SWCNT - TFT AM上实现了多点触摸传感器阵列。这种R2R凹版印刷系统克服了与每层印刷的套准精度以及阈值电压（Vth）变化相关的障碍。通过克服这些障碍，R2R凹版印刷方法可作为一种先进制造技术可行，从而能够基于SWCNT - TFT AM高通量生产柔性、一次性且人机交互的前沿电子设备。
