title: Hydrothermal Etching Treatment to Rutile TiO2 Nanorod Arrays for Improving the Efficiency of CdS-Sensitized TiO2 Solar Cells.
abstract: Highly ordered TiO2 nanorod arrays (NRAs) were directly grown on an F:SnO2 (FTO) substrate without any seed layer by hydrothermal route. For a larger surface area, the second-step hydrothermal treatment in hydrochloric acid was carried out to the as-prepared TiO2 NRAs. The results showed that the center portion of the TiO2 nanorods were dissolved in the etching solution to form a nanocave at the initial etching process. As the etching time extended, the tip parts of the nanocave wall split into lots of nanowires with a reduced diameter, giving rise to a remarkable increase of specific surface area for the TiO2 NRAs. The TiO2 films after etching treatment were sensitized by CdS quantum dots (QDs) to fabricate quantum dot-sensitized solar cells (QDSSCs), which exhibited a significant improvement in the photocurrent density in comparison with that of the un-treated device, this mainly attributed to the enhancement of QD loading and diffused reflectance ability. Through modifying the etching TiO2 films with TiCl4, a relatively high power conversion efficiency (PCE) of 3.14 % was obtained after optimizing the etching time.
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, People's Republic of China.
authors.forename: Jingshu
authors.initials: J
authors.lastname: Wan
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, People's Republic of China.
authors.forename: Rong
authors.initials: R
authors.lastname: Liu
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, People's Republic of China.
authors.forename: Yuzhu
authors.initials: Y
authors.lastname: Tong
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, People's Republic of China.
authors.forename: Shuhuang
authors.initials: S
authors.lastname: Chen
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, People's Republic of China.
authors.forename: Yunxia
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, People's Republic of China. baoyuanw@163.com.
authors.forename: Baoyuan
authors.initials: B
authors.lastname: Wang
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, People's Republic of China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, People's Republic of China. nanoguy@126.com.
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
keywords: Cadmium sulfide; Hydrothermal etching; Quantum dot-sensitized solar cells; TiO2 nanorod arrays