title: Mesoporous carbon-TiO₂ beads with nanotextured surfaces as photoanodes in dye-sensitized solar cells.
abstract: Mesoporous TiO2 and carbon-TiO2 beads with highly roughened surfaces at the nanoscale were prepared by using triblock copolymer P123 simultaneously as template and carbon source in combination with colloid self-assembly. In addition, their role as modifier of the photoanode in the efficiency enhancement of dye-sensitized solar cells is discussed. Hierarchically organized TiO2 networks can provide fast electron transport paths, and ordered mesopores can enhance light scattering as well as facilitate infiltration of the electrolyte. It was found that there is an optimum loading level of mesoporous TiO2 and carbon-TiO2 beads, that is, 1.0 and 0.5 wt%, with respect to the control P25 TiO2 nanoparticles, respectively, for maximizing the photovoltaic performance. An increase in the photovoltaic performance by up to 21.45% was achieved by incorporation of mesoporous carbon-TiO2 beads into the conventional photoanode of DSSCs owing to enhanced charge transport and collection effects.
authors.affiliation: Department of Chemistry and Nanoscience, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750 (Korea).
authors.forename: Li Na
authors.initials: LN
authors.lastname: Quan
authors.forename: Yoon Hee
authors.initials: YH
authors.lastname: Jang
authors.forename: Yu Jin
authors.initials: YJ
authors.lastname: Jang
authors.forename: Jihyeon
authors.initials: J
authors.lastname: Kim
authors.forename: Wonmok
authors.initials: W
authors.lastname: Lee
authors.forename: Jun Hyuk
authors.initials: JH
authors.lastname: Moon
authors.forename: Dong Ha
authors.initials: DH
authors.lastname: Kim
mesh_terms: D002244:Carbon / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D008863:Microspheres; D049329:Nanostructures / Q000737:chemistry*; D016062:Porosity; D012993:Solar Energy; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; C009495:titanium dioxide; D002244:Carbon; D014025:Titanium
keywords: beads; block copolymers; carbonization; inverse opals; solar cells