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Enhanced power conversion efficiency of dye-sensitized solar cells with Li2SiO3-modified photoelectrode

Title
Enhanced power conversion efficiency of dye-sensitized solar cells with Li2SiO3-modified photoelectrode
Authors
Kim, JT[Kim, Jong Tae]Lee, SH[Lee, Sung Ho]Han, YS[Han, Yoon Soo]
DGIST Authors
Kim, JT[Kim, Jong Tae]
Issue Date
2015-04-01
Citation
Applied Surface Science, 333, 134-140
Type
Article
Article Type
Article
Keywords
Conduction Band EdgeConduction Band Edge ShiftConduction BandsConversion EfficiencyCurrent Voltage CharacteristicsDye-Sensitized Solar CellDye-Sensitized Solar Cells (DSCs)Electrochemical Impedance SpectraElectrodesLithiumLithium SilicateLithium SilicatesOpen Circuit VoltagePhoto-ElectrodesPower Conversion EfficienciesReference DevicesSilicatesSoaking ProcessSolar CellsSurface DipoleSurface Modifiers
ISSN
0169-4332
Abstract
The effects of lithium silicate (LS) as a surface modifier on the performance of dye-sensitized solar cells (DSSCs) were studied. LS-modified TiO2 electrodes (LS-TiO2/FTO) prepared by a soaking process were applied to the photoelectrodes of DSSCs. The reference device without any modification showed performance of 0.68 V of open-circuit voltage (Voc), 21.40 mA/cm2 of short-circuit current (Jsc), and 63.21% of fill factor (FF), which led to a power conversion efficiency (PCE) of 9.20%, whereas for the device with the LS-TiO2/FTO electrode, the PCE was increased to 10.58% (Voc = 0.79 V, Jsc = 20.22 mA/cm2, and FF = 66.21%). By monitoring the changes in dark current-voltage characteristics, normalized IPCE spectra, and electrochemical impedance spectra, it was revealed that the LS modification induced the formation of a surface dipole on the TiO2 photoelectrode, leading to the conduction band edge shift of TiO2 toward a negative direction, and thus to an enhancement in Voc and a decrease in Jsc. © 2015 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2911
DOI
10.1016/j.apsusc.2015.01.227
Publisher
Elsevier B.V.
Files:
There are no files associated with this item.
Collection:
Division of Nano∙Energy Convergence Research1. Journal Articles


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