title: Photoinduced Dedoping of Conducting Polymers: An Approach to Precise Control of the Carrier Concentration and Understanding Transport Properties.
abstract: Exploring the various applications of conjugated polymers requires systematic studies of their physical properties as a function of the doping density, which, consequently, calls for precise control of their doping density. In this study, we report a novel solid-state photoinduced charge-transfer reaction that dedopes highly conductive polyelectrolyte complexes such as poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate). Varying the UV-irradiation time of this material allows the carrier density inside the film to be precisely controlled over more than 3 orders of magnitude. We extract the carrier density, carrier mobility, and Seebeck coefficient at different doping levels to obtain a clear image of carrier-transport mechanisms. This approach not only leads to a better understanding of the physical properties of the conducting polymer but also is useful for developing applications requiring patterned, large-area conducting polymers.
authors.affiliation: Nanomaterials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology , 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan.
authors.forename: Qingshuo
authors.initials: Q
authors.lastname: Wei
authors.affiliation: Nanomaterials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology , 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan.
authors.forename: Masakazu
authors.initials: M
authors.lastname: Mukaida
authors.affiliation: Nanomaterials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology , 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Kirihara
authors.affiliation: Nanoelectronics Research Institute, Department of Electronics and Manufacturing, National Institute of Advanced Industrial Science and Technology , Higashi 1-1-1, Tsukuba, Ibaraki 305-8562, Japan.
authors.forename: Yasuhisa
authors.initials: Y
authors.lastname: Naitoh
authors.affiliation: Nanomaterials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology , 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan.
authors.forename: Takao
authors.initials: T
authors.lastname: Ishida
keywords: carrier concentration; carrier mobility; photobase generator; polymer; semiconducting materials