title: A fully roll-to-roll gravure-printed carbon nanotube-based active matrix for multi-touch sensors.
abstract: 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.
authors.affiliation: Regional Innovation Center for Printed Electronics, Sunchon National University, Sunchon 540-742, Korea.
authors.forename: Wookyu
authors.initials: W
authors.lastname: Lee
authors.affiliation: Department of Printed Electronics Engineering, Sunchon National University, Sunchon 540-742, Korea.
authors.forename: Hyunmo
authors.initials: H
authors.lastname: Koo
authors.affiliation: Department of Printed Electronics Engineering, Sunchon National University, Sunchon 540-742, Korea.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Sun
authors.affiliation: Department of Printed Electronics Engineering, Sunchon National University, Sunchon 540-742, Korea.
authors.forename: Jinsoo
authors.initials: J
authors.lastname: Noh
authors.affiliation: Department of Mechanical Engineering, Soonchunhyang University, Asan 336-745, Korea.
authors.forename: Kye-Si
authors.initials: KS
authors.lastname: Kwon
authors.affiliation: Department of Printed Electronics Engineering, Sunchon National University, Sunchon 540-742, Korea.
authors.forename: Chiseon
authors.initials: C
authors.lastname: Yeom
authors.affiliation: Department of Printed Electronics Engineering, Sunchon National University, Sunchon 540-742, Korea.
authors.forename: Younchang
authors.initials: Y
authors.lastname: Choi
authors.affiliation: Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States.
authors.forename: Kevin
authors.initials: K
authors.lastname: Chen
authors.affiliation: Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States.
authors.forename: Ali
authors.initials: A
authors.lastname: Javey
authors.affiliation: 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.
authors.forename: Gyoujin
authors.initials: G
authors.lastname: Cho
mesh_terms: D004582:Electronics, Medical / Q000295:instrumentation*; D006801:Humans; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011093:Polyethylene Terephthalates / Q000737:chemistry; D011327:Printing; D012666:Semiconductors; D014173:Transistors, Electronic; D014584:User-Computer Interface
chemical_list: D037742:Nanotubes, Carbon; D011093:Polyethylene Terephthalates