title: Orientation-Controllable ZnO Nanorod Array Using Imprinting Method for Maximum Light Utilization in Dye-Sensitized Solar Cells.
abstract: We present a holey titanium dioxide (TiO2) film combined with a periodically aligned ZnO nanorod layer (ZNL) for maximum light utilization in dye-sensitized solar cells (DSCs). Both the holey TiO2 film and the ZNL were simultaneously fabricated by imprint technique with a mold having vertically aligned ZnO nanorod (NR) array, which was transferred to the TiO2 film after imprinting. The orientation of the transferred ZNL such as laid, tilted, and standing ZnO NRs was dependent on the pitch and height of the ZnO NRs of the mold. The photoanode composed of the holey TiO2 film with the ZNL synergistically utilized the sunlight due to enhanced light scattering and absorption. The best power conversion efficiency of 8.5 % was achieved from the DSC with the standing ZNL, which represented a 33 % improvement compared to the reference cell with a planar TiO2.
authors.affiliation: School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, Republic of Korea, heesoo@gist.ac.kr.
authors.forename: Huisu
authors.initials: H
authors.lastname: Jeong
authors.forename: Hui
authors.initials: H
authors.lastname: Song
authors.forename: Ryeri
authors.initials: R
authors.lastname: Lee
authors.forename: Yusin
authors.initials: Y
authors.lastname: Pak
authors.forename: Yogeenth
authors.initials: Y
authors.lastname: Kumaresan
authors.forename: Heon
authors.initials: H
authors.lastname: Lee
authors.forename: Gun Young
authors.initials: GY
authors.lastname: Jung