{"id":1719,"date":"2022-08-10T19:49:54","date_gmt":"2022-08-10T11:49:54","guid":{"rendered":"https:\/\/diau08.lab.nycu.edu.tw\/?p=1719"},"modified":"2022-12-07T18:49:14","modified_gmt":"2022-12-07T10:49:14","slug":"2012%e7%a0%94%e7%a9%b6%e6%88%90%e6%9e%9c","status":"publish","type":"post","link":"https:\/\/diau08.lab.nycu.edu.tw\/en\/2022\/08\/1719\/","title":{"rendered":"2012 Research Results"},"content":{"rendered":"
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Morphological Control of Platinum Nanostructures for Highly Efficient Dye-sensitized Solar Cells<\/strong><\/p>\n\n\n\n

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SEM images of Pt nanograss (left) and nanoflower (right) obtained using a novel cyclic electro-deposition (CED) approach.<\/strong><\/figcaption><\/figure>\n\n\n\n

Cyclic electro-deposition (CED) is a cost-effective tool to synthesize nanostructures with a solution process, controllable morphology and high purity. Here we report novel platinum nanostructures fabricated according to CED at room temperature in solution containing H2<\/sub>PtCl6<\/sub> precursor and NaNO3<\/sub>. Remarkable Pt nanostructures, from nanocluster, nanosheet, nanograss to nanoflower, were produced through morphological control via variation of either period of CED scans or concentration of the precursor.<\/p>\n\n\n\n

Pt films with uniform nanograss structure have great electro-catalytic performance and intrinsic light-scattering, perfectly suitable for use as counter electrodes for dye-sensitized solar cell (DSSC). The corresponding DSSC device attained efficiency 9.61 %, which is 12 % enhanced from that fabricated according to a conventional method via thermal decomposition under similar experimental conditions.
* L.-L. Li, C.-W. Chang, H.-H. Wu, J.-W. Shiu, P.-T. Wu, E. W.-G. Diau, \u201cMorphological control of platinum nanostructures for highly efficient dye-sensitized solar cells\u201d, J. Mater. Chem. 22<\/strong>, 6267 (2012).<\/p>\n\n\n\n

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Design and Characterization of Heteroleptic Ruthenium Complexes Containing Benzimidazole Ligands for Dye-sensitized Solar Cells: The Effect of Fluorine Substituents on Photovoltaic Performance<\/strong><\/p>\n\n\n\n

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Molecular design of a heteroleptic ruthenium complex containing the benzimidazole ligand with possible substitutions in the A, B, C<\/strong> and D<\/strong> positions.<\/figcaption><\/figure>\n\n\n\n

Heteroleptic ruthenium complexes (RD12-RD15) containing fluoro-substituted benzimidazole ligands were designed, synthesized and characterized for dye-sensitized solar cells. The resulting devices show a systematic trend of increasingVOC<\/sub> and decreasing JSC with fluorine atoms of increasing number substituted on the ligand.<\/p>\n\n\n\n

Results of femtosecond infrared transient absorption spectroscopy, charge extraction and the intensity-modulated photovoltage spectra are consistent with the variation of VOC<\/sub> for the systems. The best device (RD12) attained an efficiency 9.6 % of power conversion, superior to that of N719 ( \u03b7= 9.3 %) under the same experimental conditions.
* W.-K. Huang, H.-P. Wu, P.-L. Lin, Y.-P. Lee, E. W.-G. Diau, \u201cDesign and Characterization of Heteroleptic Ruthenium Complexes Containing Benzimidazole Ligands for Dye-sensitized Solar Cells:. The Effect of Fluorine Substituents on Photovoltaic Performance\u201d, J. Phys. Chem. Lett. 3<\/strong>, 1830 (2012).<\/p>\n\n\n\n

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Enhanced photovoltaic performance with co-sensitization of porphyrin and an organic dye in dye-sensitized solar cells<\/strong><\/p>\n\n\n\n

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A stepwise co-sensitization of a zinc porphyrin (LD12) with an organic dye (CD5) significantly improved the photovoltaic performance.<\/figcaption><\/figure>\n\n\n\n

A stepwise approach for co-sensitization of a zinc porphyrin sensitizer (LD12) with a spirally configured organic dye (CD5) for dye-sensitized solar cells significantly enhanced VOC and JSC relative to their individual single-dye sensitized devices.<\/p>\n\n\n\n

A stepwise approach for co-sensitization of a zinc porphyrin sensitizer (LD12) with a spirally configured organic dye (CD5) for dye-sensitized solar cells significantly enhanced V<\/em>OC<\/sub> and J<\/em>SC<\/sub> relative to their individual single-dye sensitized devices. upon optimization, the device made of the LD12+CD5 system yielded J<\/em>SC<\/sub>\/mA cm-2 = 16.7, V<\/em>OC<\/sub>\/V = 0.74, FF = 0.73 and \u03b7 = 9.0 %, which is superior to that of either individual device made from LD12(h = 7.5 %) and CD5 (\u03b7 = 5.7 %) under the same conditions of fabrication. The photocurrent density J<\/em>SC<\/sub> is enhanced because of the combined light-harvesting effect of the two dyes that have complementary absorption spectra, and the photovoltageV<\/em>OC<\/sub> is enhanced because the retarded charge recombination overwhelmed the shift down of the TiO<\/em>2<\/sub> potential.<\/p>\n\n\n\n

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Molecular Engineering of Cocktail Co-sensitization for Efficient Panchromatic Porphyrin-sensitized Solar Cells<\/strong><\/p>\n\n\n\n

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Three-dye co-sensitized device exhibited a remarkable enhancement on cell performance, in particular in the NIR region.<\/figcaption><\/figure>\n\n\n\n

Co-sensitization of three spectrally complementary dyes (YD2-oC8, YDD6 and CD4) on TiO2 film in a well-designed cocktail solution significantly improved the photovoltaic performance of the device.
A systematic approach is proposed for engineering of molecular co-sensitization of TiO2 films in a cocktail solution containing a push-pull zinc porphyrin (YD2-oC8), an organic dye (CD4) and a porphyrin dimer (YDD6) in a specific molar ratio to optimize the photovoltaic performance of the device. The resulting device showed panchromatic spectral features in the IPCE action spectrum in region 400-700 nm attaining efficiencies 75-80 %; the spectrum is extended to the near-IR region attaining 40-45 % in 700-800 nm, giving JSC\/mA cm-2 = 19.28, VOC\/mV = 753, FF = 0.719, and \u03b7 = 10.4 %, which is superior to the single-dye (YD2-oC8,\u03b7 = 8.8 %) or the two-dye (YD2-oC8+CD4, \u03b7 = 9.2 %) co-sensitized system.
* H.-P. Wu,Z.-W. Ou, T.-Y. Pan, C.-M. Lan, W.-K. Huang, H.-W. Lee,N. M. Reddy, C.-T. Chen, W.-S. Chao,C.-Y. Yeh and E. W.-G. Diau, \u201cMolecular Engineering of Cocktail Co-sensitization for Efficient Panchromatic Porphyrin-sensitized Solar Cells\u201d, Energy Environ. Sci.<\/em>2012<\/strong>, 5<\/em>, 9843-9848(2012)<\/p>","protected":false},"excerpt":{"rendered":"

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