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Electrospun ZnO Nanofibers as a Photoelectrode in Dye-Sensitized Solar Cells

Title
Electrospun ZnO Nanofibers as a Photoelectrode in Dye-Sensitized Solar Cells
Authors
Kim, Jeong-HwaKim, Kang-PilKim, Dae-HwanHwang, Dae-Kue
DGIST Authors
Kim, Kang-PilKim, Dae-HwanHwang, Dae-Kue
Issue Date
2015-03
Citation
Journal of Nanoscience and Nanotechnology, 15(3), 2346-2350
Type
Article
Article Type
Article
Keywords
Collector EfficiencyCrystalline StructureDye-Sensitized Solar Cells (DSCs)Dye Sensitized Solar CellsEfficiency LevelsElectrochemical ImpedanceElectrodesElectron TransportElectron Transport PropertiesElectronsElectrospinningGeometrical StructureInterference SuppressionNano-Structured MaterialsNanofibersOpen Circuit VoltageOpen Circuit Voltage DecaysPhoto-ElectrodeScanning Electron MicroscopySimulated SunlightSolar CellsSpinning (Fibers)Thermogravimetric AnalysisX Ray DiffractionZinc OxideZnO Photoelectrode
ISSN
1533-4880
Abstract
A nanoparticle-based DSSC shows limited efficiency levels due to its disordered geometrical structure and interfacial interference during electron transport, whereas the use of nanofibers in a DSSC can increase the electron mobility at the interfacial area of the materials due to the reduced recombination of electrons before reaching the collecting electrode. In this study, we describe the fabrication and characteristics of a ZnO nanofiber electrode for DSSC. From the results of a thermogravimetric analysis, a stepped heat treatment was developed for the calcinations of the ZnO electrodes. The ZnO electrode morphology and crystalline structure were confirmed by scanning electron microscopy and the X-ray diffraction patterns, respectively. The DSSC with the ZnO nanofiber photoelectrode (wire shaped) created by electrospinning showed an enhanced short-circuit current density (37% enhancement) compared to that of a ZnO sphere particle-shaped photoelectrode under irradiation of AM 1.5 simulated sunlight (100 mW/cm2). Moreover, we have investigated the origin of the improved performance through electrochemical impedance spectroscopic (EIS) and open-circuit voltage-decay (OCVD) measurements. Copyright © 2015 American Scientific Publishers. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/5204
DOI
10.1166/jnn.2015.10256
Publisher
American Scientific Publishers
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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