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Suda, Masayuki; Kato, Reizo; Yamamoto, Hiroshi M.
Science (American Association for the Advancement of Science), 02/2015, Letnik: 347, Številka: 6223Journal Article
Electric double layers (EDLs) of ionic liquids have been used in superconducting field-effect transistors as nanogap capacitors. Because of the freezing of the ionic motion below ∼200 kelvin, modulations of the carrier density have been limited to the high-temperature regime. Here we observe carrier-doping–induced superconductivity in an organic Mott insulator with a photoinduced EDL based on a photochromic spiropyran monolayer. Because the spiropyran can isomerize reversibly between nonionic and zwitterionic isomers through photochemical processes, two distinct built-in electric fields can modulate the carrier density even at cryogenic conditions.
