- Coating Property of Hybrid Structured Photo-Electrode to Increase Dye-Sensitized Solar Cells Efficiency
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Min-Hee Kim, Hyung-Woo Lee, Young-Keun Jeong
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J Korean Powder Metall Inst. 2010;17(6):449-455.
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DOI: https://doi.org/10.4150/KPMI.2010.17.6.449
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- The hybrid structured photo-electrode for dye-sensitized solar cells was fabricated based on the composites of TiO_2 nanoparticles and nanowires. Three samples with different hybrid structures were prepared with 17 vol%, 43 vol%, and 100 vol% nanowires. The energy conversion efficiency was enhanced from 5.54% for pure nanoparticle cells to 6.01% for the hybrid structure with 17 vol% nanowires. For the hybrid structured layers with high nanowires concentration (43 vol% and 100 vol%), the efficiency decreased with the nanowire concentration, because of the decrease of specific surface area, and of thus decreased current density. The random orientations of TiO_2 nanowires can be preserved by the doctor blade process, resulted in the enhanced efficiency. The hybrid structured TiO_2 layer can possess the advantages of the high surface area of nanoparticles and the rapid electron transport rate and the light scattering effect of nanowires.
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Citations to this article as recorded by  - N-Doped ZnO Nanoparticle-Carbon Nanofiber Composites for Use as Low-Cost Counter Electrode in Dye-Sensitized Solar Cells
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Korean Journal of Materials Research.2014; 24(10): 565~571. CrossRef
- The Effect of Electrical Characteristics and Electrode Shape on Alignment of Multi-walled Carbon Nanotubes
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Se-Hun Kwon, Young-Keun Jeong, Chang-Sik Jung, Myung-Chang Kang, Hyung-Woo Lee
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J Korean Powder Metall Inst. 2010;17(4):326-335.
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DOI: https://doi.org/10.4150/KPMI.2010.17.4.326
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Abstract
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- In this paper, the effect of electrical characteristics and electrode shape on the alignment and attachment of multi-walled carbon nanotubes (MWNTs) has been studied. The attraction and alignment of MWNTs between the gaps has been investigated by applying electric field which is called electrophoresis and dielectrophoresis. According to the frequency of electric field, positive or negative dielectrophoretic force can be determined. The concentration of MWNTs solution was 5;µg/ml, and a droplet of 1.0sim1.5;µl was dropped between two electrodes. Through the repeated experiments, the optimal electrical conditions for aligning and attaching MWNTs in the desired places were obtained. Since the frequency range of 100 kHz~10 MHz generated positive dielectrophoretic force, MWNTs were attracted and aligned between the gaps with this frequency range. For generating enough force to attract MWNTs, the appropriate voltage range was 0.3sim1.3;V_rms/µm. Furthermore, the effect of electrode shape on the alignment of MWNTs was investigated. A single MWNT attachment was accomplished on the round shaped with 70% yield.
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