Low-Temperature Fabrication of Dye-Sensitized ZnO Electrodes via Zinc Hydroxide Acetate by Utilizing Liquid Phase

2013 ◽  
Vol 582 ◽  
pp. 202-205 ◽  
Author(s):  
Shintaro Ueno ◽  
Hirokazu Utsunomiya ◽  
Shinobu Fujihara
Keyword(s):  
Zinc Acetate ◽  
Dye Sensitized Solar Cells ◽  
Energy Conversion Efficiency ◽  
Precipitation Method ◽  
Zno Films ◽  
Zinc Hydroxide ◽  
Plastic Substrates ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Dissolution And Precipitation

For fabrication of plastic dye-sensitized solar cells, we propose a dissolution and precipitation method to form nanostructured ZnO films on plastic substrates. Layered hydroxide zinc acetate (LHZA) films on plastic substrates were immersed in acetonitrile at 60 oC. They were converted into ZnO films through the dissolution of LHZA and the precipitation of ZnO in acetonitrile. The resultant films contained a large amount of zinc acetate compound impurities, which were attempted to be removed from the ZnO films by dissolving in water. We achieved the energy conversion efficiency of 2.3% for the N719/ZnO electrode on an ITO-PEN substrate.

Fabrication of Nanostructured Zinc Oxide Films on Plastic Substrates by Pyrolysis Method and their Application to Dye-Sensitized Solar Cells

2013 ◽  
Vol 582 ◽  
pp. 206-209 ◽  
Author(s):  
Hirokazu Utsunomiya ◽  
Shintaro Ueno ◽  
Shinobu Fujihara
Keyword(s):  
Solar Cells ◽  
Zinc Acetate ◽  
Dye Sensitized Solar Cells ◽  
Hot Water ◽  
Zno Films ◽  
Polyethylene Naphthalate ◽  
Plastic Substrates ◽  
Dye Sensitized ◽  
Pyrolysis Method ◽  
Sensitized Solar Cells

t has been attempted to utilize plastic substrates for electrodes, instead of conventional glass substrates, to fabricate flexible, lightweight, and low-cost dye-sensitized solar cells (DSSCs). We examined a pyrolysis method by which preformed layered hydroxide zinc acetate (LHZA: Zn5(OH)8(CH3COO)2·2H2O) films were converted into ZnO films at temperatures below 120 oC. Since the pyrolyzed films still contained zinc acetate compounds, they were immersed in hot water aiming at removing such the impurities. This hot water treatment influenced the film morphology to a large extent. The energy conversion efficiency of 3.41% was obtained for the cell using an N719/ZnO electrode fabricated on an indium tin oxide-coated polyethylene naphthalate (ITO-PEN) substrate through the present pyrolysis method.

Chemical Modification on Hierarchically Structured ZnO Films for Energy Conversion Efficiency Enhancement of Dye-Sensitized Solar Cells

2008 ◽  
Vol 1102 ◽  
Author(s):  
Qifeng Zhang ◽  
Samson A Jenekhe ◽  
Guozhong Cao
Keyword(s):  
Solar Cells ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Dye Sensitized Solar Cells ◽  
Energy Conversion Efficiency ◽  
Zno Films ◽  
Zno Film ◽  
Dye Sensitized ◽  
Induced Changes ◽  
Sensitized Solar Cells

AbstractWe report the synthesis of ZnO aggregates in the presence of lithium salt and the enhancement on the energy conversion efficiency of dye sensitized solar cells when the photoelectrode films consist of as-synthesized ZnO aggregates. The conversion efficiency for ZnO film consisting of aggregates synthesized with lithium involvement is significantly improved up to 5.8%, which is 32% higher than that of 4.4% obtained for pure ZnO film. Such an enhancement can be attributed to the effect of lithium-induced changes on the morphology and crystallinity of aggregates, the optical absorption of films, and the surface chemistry of ZnO, which provides the film with decreased electron trapping and increased refractive index, and enhances the electronic coupling between the dye molecules and ZnO.

scholarly journals Effective Sol-Gel Nanocoatings on ZnO Electrodes for Suppressing Recombination in Dye-Sensitized Solar Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Shintaro Ueno ◽  
Shinobu Fujihara
Keyword(s):  
Solar Cells ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Energy Conversion Efficiency ◽  
Zno Films ◽  
Metal Alkoxide ◽  
Dye Sensitized ◽  
Low Concentrations ◽  
Coating Layers ◽  
Sensitized Solar Cells

Attempts have been made to improve the performance of dye-sensitized solar cells by forming metal-oxide nanocoating layers on ZnO electrodes by a sol-gel transformation. SiO2, Nb2O5, TiO2, or ZrO2nanocoating layers could be formed by dipping ZnO films into metal alkoxide solutions of low concentrations and subsequent heat treatments. The performance of DSSCs using the coated ZnO electrodes depends strongly on the structure of coating layers such as the thickness and the surface coverage, which are significantly influenced by the coating conditions. In particular, SiO2and Nb2O5coating layers are effective to suppress the recombination by constructing the energy barrier at the ZnO/electrolyte interface and enhance energy conversion efficiency. It is found that the coating layers also hinder the grain growth of ZnO, contributing to the enhanced cell performance as well.

TiO2 cement for high-performance dye-sensitized solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 83802-83807 ◽  
Author(s):  
Yu Hou ◽  
Shuang Yang ◽  
Chunzhong Li ◽  
Huijun Zhao ◽  
Hua Gui Yang
Keyword(s):  
Solar Cells ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
High Performance ◽  
Dye Sensitized Solar Cells ◽  
Energy Conversion Efficiency ◽  
Dye Sensitized ◽  
Degussa P25 ◽  
Sensitized Solar Cells

An energy conversion efficiency of 8.31% is reached by using a cemented photoanode for dye-sensitized solar cells, attaining a 31.1% improvement over the standard Degussa P25 sample.

Transparent conductive Ga-doped ZnO films and their application in dye-sensitized solar cells

2012 ◽  
Vol 60 (12) ◽  
pp. 2025-2028 ◽  
Author(s):  
Ji-Hong Kim ◽  
Kyung-Ju Lee ◽  
Ji-Hyung Roh ◽  
Sang-Woo Song ◽  
Jae-Ho Park ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Zno Films ◽  
Dye Sensitized ◽  
Doped Zno ◽  
Sensitized Solar Cells
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