title: Carbon nanotube active-matrix backplanes for mechanically flexible visible light and X-ray imagers.
abstract: We report visible light and X-ray imagers on lightweight and mechanically flexible plastic substrates. The process involves solution processing of organic photodetectors on top of an active-matrix backplane consisting of carbon nanotube thin-film transistors. The system takes advantage of the high mobility of nanotube transistors for low operating voltages and efficient light absorption of organic bulk-heterojunctions for high imaging sensitivity. With this highly scalable process scheme, 18 × 18 pixel-array flexible imagers (physical size of 2 cm × 1.5 cm) with high performance are successfully demonstrated. In addition, as the absorption peak of the adopted organic photodiodes covers the green band of the light spectrum, X-ray imaging is readily demonstrated by placing a scintillator film on top of the flexible imagers.
authors.affiliation: Electrical Engineering and Computer Sciences and ‡Berkeley Sensor and Actuator Center, University of California , Berkeley, California 94702, United States.
authors.forename: Toshitake
authors.initials: T
authors.lastname: Takahashi
authors.forename: Zhibin
authors.initials: Z
authors.lastname: Yu
authors.forename: Kevin
authors.initials: K
authors.lastname: Chen
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kiriya
authors.forename: Chuan
authors.initials: C
authors.lastname: Wang
authors.forename: Kuniharu
authors.initials: K
authors.lastname: Takei
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shiraki
authors.forename: Teresa
authors.initials: T
authors.lastname: Chen
authors.forename: Biwu
authors.initials: B
authors.lastname: Ma
authors.forename: Ali
authors.initials: A
authors.lastname: Javey
mesh_terms: D006801:Humans; D008027:Light; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D014173:Transistors, Electronic; D014965:X-Rays
chemical_list: D037742:Nanotubes, Carbon