title: Fabrication of Ultra-Thin Printed Organic TFT CMOS Logic Circuits Optimized for Low-Voltage Wearable Sensor Applications.
abstract: Ultrathin electronic circuits that can be manufactured by using conventional printing technologies are key elements necessary to realize wearable health sensors and next-generation flexible electronic devices. Due to their low level of power consumption, complementary (CMOS) circuits using both types of semiconductors can be easily employed in wireless devices. Here, we describe ultrathin CMOS logic circuits, for which not only the source/drain electrodes but also the semiconductor layers were printed. Both p-type and n-type organic thin film transistor devices were employed in a D-flip flop circuit in the newly developed stacked structure and exhibited excellent electrical characteristics, including good carrier mobilities of 0.34 and 0.21 cm(2) V(-1) sec(-1), and threshold voltages of nearly 0 V with low operating voltages. These printed organic CMOS D-flip flop circuits exhibit operating frequencies of 75 Hz and demonstrate great potential for flexible and printed electronics technology, particularly for wearable sensor applications with wireless connectivity.
authors.affiliation: Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Takeda
authors.affiliation: Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
authors.forename: Kazuma
authors.initials: K
authors.lastname: Hayasaka
authors.affiliation: Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
authors.forename: Rei
authors.initials: R
authors.lastname: Shiwaku
authors.affiliation: Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Yokosawa
authors.affiliation: Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
authors.forename: Takeo
authors.initials: T
authors.lastname: Shiba
authors.affiliation: Innovation Center for Organic Electronics (INOEL), Graduate School of Science and Engineering, Yamagata University, 1-808-48, Arcadia, Yonezawa, Yamagata 992-0119, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Mamada
authors.affiliation: Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kumaki
authors.affiliation: Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.|Japan Science and Technology Agency, PRESTO, 4-1-8, Honcho, Kawaguchi, Saitama, 332-0012, Japan.
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Fukuda
authors.affiliation: Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
authors.forename: Shizuo
authors.initials: S
authors.lastname: Tokito