title: Laser Patterning of Optically Reconfigurable Transistor Channels in a Photochromic Diarylethene Layer.
abstract: Optical switching organic field-effect transistors (OFETs) provide a new direction for optoelectronics based on photochromic molecules. However, the patterning of OFETs is difficult because conventional fabrication processes, including lithography and ion etching, inevitably cause severe damage to organic molecules. Here, we demonstrate laser patterning of one-dimensional (1D) channels on an OFET with a photochromic diarylethene (DAE) layer. The main findings are (i) a number of 1D channels can be repeatedly written and erased in the DAE layer by scanning focused ultraviolet and visible light laser beams alternately between the source and drain electrodes, (ii) the conductivity (or resistivity) of the 1D channel can be controlled by the illumination conditions, such as the laser power density and the scan speed, and (iii) it is possible to draw an analogue adder circuit by optically writing 1D channels so that a portion of the channels overlaps and to perform optical summing operations by local laser illumination of the respective channels. These findings will open new possibilities for realizing various optically reconfigurable, low-dimensional organic transistor circuits, which are not possible with conventional thin film OFETs.
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki, Tsukuba, 305-0044, Japan.
authors.forename: Tohru
authors.initials: T
authors.lastname: Tsuruoka
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki, Tsukuba, 305-0044, Japan.
authors.forename: Ryoma
authors.initials: R
authors.lastname: Hayakawa
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki, Tsukuba, 305-0044, Japan.|Department of Chemistry and Biochemistry, Faculty of Engineering, Kyushu University , 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Kobashi
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University , Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Higashiguchi
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University , Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Matsuda
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki, Tsukuba, 305-0044, Japan.|Department of Chemistry and Biochemistry, Faculty of Engineering, Kyushu University , 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Wakayama
keywords: Organic field-effect transistor; analogue adder circuit; diarylethene; laser patterning; one-dimensional channel; photochromism