近期，本课题组张敏老师和范凌冲同学分别以通讯作者和第一作者在IEEE Transactions on Electron Devices上发表了题为“Stretchable Carbon Nanotube Thin-Film Transistor Arrays Realized by a Universal Transferable-Band-Aid Method”的研究成果。
本文提出了一种可转移的创可贴方法同时实现具有优异电性能和高可拉伸性的碳纳米管(CNT)薄膜晶体管(TFT)阵列，该阵列具有优异的可转移性、保形性和通用性，在100%拉伸2000次后器件性能没有退化，此外还对其机械性能进行了仿真分析。这种创可贴结构可以转移到弹性衬底以及非常规衬底上，为将柔性器件转化为可拉伸器件提供了一种新的解决方案。
Stretchable electronics offer new possibilities for humans and artificial intelligent robots, in which stretchable transistors are the core components. Either geometric engineering or intrinsic material integration has its own limitations for realizing high-performance stretchable transistors. In this work, by combining the advantages of both approaches, we propose a novel transferable-Band-Aid method to realize stretchable carbon nanotube (CNT) thin-film transistor (TFT) arrays with high electrical performance and stretchability simultaneously. This method uses polyimide (PI) tapes to transfer devices to elastomer substrates. The mobility and ON/OFF current ratio of the stretchable CNT-TFTs reach 24cm2/V·s and1.1×105, respectively. After stretched by 50% and 100% for 2000 cycles, the device performance is maintained on both polydimethylsiloxane and Ecoflex substrates. Neither obvious degradation on electrical properties nor displacement between the PI and the elastomer is observed during the stretching. The mechanical performance of the stretchable devices has also been verified and analyzed by simulation using ANSYS. Young’s modulus ratio between the stiff island and the elastomer substrate influences stretchability and stress distribution of the devices. The simulation result provides a guideline for realizing highly robust stretchable devices. The Band-Aid structure could generally be stuck to most elastomer substrates, providing a new solution to convert flexible devices into stretchable devices universally. The demonstrations of the design exhibit its excellent transferability, conformal capability, and versatility, showing its application potentials in wearable devices, biological-human interfaces and Internet of Things.
文章链接：
https://ieeexplore.ieee.org/document/9557790
