title: Optically controllable dual-gate organic transistor produced via phase separation between polymer semiconductor and photochromic spiropyran molecules.
abstract: We produced an optically controllable dual-gate organic field-effect transistor by a simple one-step spin-coating of a mixed solution of photochromic spiropyran (SP) and poly(3-hexylthiophene) (P3HT). Postannealing enhanced polymer chain ordering of P3HT to induce phase separation into an SP-rich lower layer and an SP-free upper layer. These layers worked independently as transistor channels with distinct optical responsivity. The top channel was optically inactive, but the bottom channel was optically active, because of the photoisomerization of SP. These results demonstrate the potential of our technique to produce a multifunctional photoactive organic transistor by a simple process.
authors.affiliation: Department of Chemistry and Biochemistry, Faculty of Engineering, Kyushu University , 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Ishiguro
authors.forename: Ryoma
authors.initials: R
authors.lastname: Hayakawa
authors.forename: Toyohiro
authors.initials: T
authors.lastname: Chikyow
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Wakayama