title: Efficient Blue-Colored Solid-State Dye-Sensitized Solar Cells: Enhanced Charge Collection by Using an in Situ Photoelectrochemically Generated Conducting Polymer Hole Conductor.
abstract: A high power conversion efficiency (PCE) of 5.5 % was achieved by efficiently incorporating a diketopyrrolopyrrole-based dye with a conducting polymer poly(3,4-ethylenediothiophene) (PEDOT) hole-transporting material (HTM) that was formed in situ, compared with a PCE of 2.9 % for small molecular spiro-OMeTAD-based solid-state dye solar cells (sDSCs). The high PCE for PEDOT-based sDSCs is mainly attributed to the significantly enhanced charge-collection efficiency, as a result of the three-order-of-magnitude higher hole conductivity (0.53 S cm(-1) ) compared with that of the widely used low molecular weight HTM spiro-OMeTAD (3.5×10(-4)  S cm(-1) ).
authors.affiliation: Department of Chemistry-Ångström, Centre of Molecular Devices, Uppsala University, 75120, Uppsala, Sweden.
authors.forename: Jinbao
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne Chemin des Alambics, Station 6, Lausanne, 1015, Switzerland. nikolaos.vlachopoulos@epfl.ch.
authors.forename: Nick
authors.initials: N
authors.lastname: Vlachopoulos
authors.affiliation: Department of Chemistry-Ångström, Centre of Molecular Devices, Uppsala University, 75120, Uppsala, Sweden.
authors.forename: Yan
authors.initials: Y
authors.lastname: Hao
authors.affiliation: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology (EPFL), Station 6, Lausanne, 1015, Switzerland.
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Holcombe
authors.affiliation: Department of Chemistry-Ångström, Centre of Molecular Devices, Uppsala University, 75120, Uppsala, Sweden.
authors.forename: Gerrit
authors.initials: G
authors.lastname: Boschloo
authors.affiliation: Department of Chemistry-Ångström, Centre of Molecular Devices, Uppsala University, 75120, Uppsala, Sweden. erik.johansson@kemi.uu.se.
authors.forename: Erik M J
authors.initials: EM
authors.lastname: Johansson
authors.affiliation: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology (EPFL), Station 6, Lausanne, 1015, Switzerland.
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
authors.affiliation: Department of Chemistry-Ångström, Centre of Molecular Devices, Uppsala University, 75120, Uppsala, Sweden.|Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne Chemin des Alambics, Station 6, Lausanne, 1015, Switzerland.
authors.forename: Anders
authors.initials: A
authors.lastname: Hagfeldt
keywords: PEDOT; dyes/pigments; hole-transporting material; photochemistry; polymerization