title: Fabrication and photovoltaic properties of heterostructured TiO2 nanowires.
abstract: One-dimensional heterostructured TiO2 nanowires were successfully fabricated by an electrospinning technique and modified by hydrolysis. We investigated their structure, morphology, chemical composition, and optical properties by using the X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-vis spectroscopy. In the case of the photovoltaic performance, the short-circuit current density and cell efficiency of the DSSCs employing single TiO2 nanowires and heterostructured TiO2 nanowires improve from 6.90 to 11.38 mA/cm2 and from 2.56 to 4.29%, respectively. The results show that the photoconversion efficiency of the heterostructured TiO2 nanowires could be improved by more than approximately 67% compared to that of the single TiO2 nanowires because of the enhanced specific surface area that facilitates dye adsorption.
authors.affiliation: Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 139-743, South Korea.
authors.forename: Suk-In
authors.initials: SI
authors.lastname: Noh
authors.forename: Dong-Won
authors.initials: DW
authors.lastname: Park
authors.forename: Hee-Sang
authors.initials: HS
authors.lastname: Shim
authors.forename: Hyo-Jin
authors.initials: HJ
authors.lastname: Ahn