The Experts below are selected from a list of 43401 Experts worldwide ranked by ideXlab platform
Michael Gratzel - One of the best experts on this subject based on the ideXlab platform.
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facile preparation of large aspect ratio ellipsoidal anatase tio2 nanoparticles and their application to dye sensitized Solar Cell
Electrochemistry Communications, 2009Co-Authors: In Chan Baek, Muga Vithal, Jeong Ah Chang, Yongchae Chung, Michael Gratzel, Mohammad Khaja Nazeeruddin, Sang Il SeokAbstract:A simple one-step heat-treatment of peroxotitanate complex aqueous solution at around 100 degrees C was resulted in the formation of ellipsoidal anatase TiO2 nanoparticles having a high aspect ratio with no branches. The length of these ellipsoidal TiO2 falls in the range of 200-350 nm, depending on mole ratio of Ti4+/H2O2. Dye-Sensitized Solar Cell based on these ellipsoidal nanocrystalline TiO2 as photoanode was fabricated and characterized. (C) 2009 Elsevier B.V. All rights reserved.
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nanocrystalline dye sensitized Solar Cell copper indium gallium selenide thin film tandem showing greater than 15 conversion efficiency
Applied Physics Letters, 2006Co-Authors: Paul Liska, K. Ravindranathan Thampi, David Bremaud, H M Upadhyaya, Dg Rudmann, Michael Gratzel, A.n TiwariAbstract:Multijunction stacked (tandem) Solar Cells can increase the overall photovoltaic conversion efficiency by optimal utilization of the Solar spectrum in individual Cells. We demonstrate that a photovoltaic tandem Cell comprising a nanocrystalline Dye-Sensitized Solar Cell as a top Cell for high-energy photons and a copper indium gallium selenide thin-film bottom Cell for lower-energy photons produces AM 1.5 Solar to electric conversion efficiencies greater than 15%.
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stable 8 efficient nanocrystalline dye sensitized Solar Cell based on an electrolyte of low volatility
Applied Physics Letters, 2005Co-Authors: Peng Wang, Cedric Klein, Shaik M Zakeeruddin, Robin Humphrybaker, Michael GratzelAbstract:We demonstrate a ⩾8% efficient nanocrystalline Dye-Sensitized Solar Cell retaining over 98% of its initial performance after 1000 h of accelerated tests subjected to thermal stress at 80 °C in the dark. Device degradation was also negligible following 1000 h of visible light soaking at 60 °C. This high performance and stable device was realized by using a robust electrolyte of low volatility in conjunction with the amphiphilic ruthenium sensitizer [Ru(4,4′-dicarboxylic acid-2,2′-bipyridine)(4,4′-bis(p-hexyloxystyryl)-2,2′-bipyridine)(NCS)2], coded as K-19, which was grafted together with 1-decylphosphonic acid on the mesoporous titania film acting as photoanode.We demonstrate a ⩾8% efficient nanocrystalline Dye-Sensitized Solar Cell retaining over 98% of its initial performance after 1000 h of accelerated tests subjected to thermal stress at 80 °C in the dark. Device degradation was also negligible following 1000 h of visible light soaking at 60 °C. This high performance and stable device was realized by using a robust electrolyte of low volatility in conjunction with the amphiphilic ruthenium sensitizer [Ru(4,4′-dicarboxylic acid-2,2′-bipyridine)(4,4′-bis(p-hexyloxystyryl)-2,2′-bipyridine)(NCS)2], coded as K-19, which was grafted together with 1-decylphosphonic acid on the mesoporous titania film acting as photoanode.
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Ambient temperature plastic crystal electrolyte for efficient, all-solid-state Dye-Sensitized Solar Cell.
Journal of the American Chemical Society, 2004Co-Authors: Peng Wang, Qing Dai, M. Zakeeruddin, Maria Forsyth, Douglas R. Macfarlane, Michael GratzelAbstract:Doping the molecular plastic crystal of succinonitrile with solid N-methyl-N-butylpyrrolidinium iodide salt and iodine has produced a highly conductive solid iodide/triiodide conductor. Furthermore, it was employed for a highly efficient, all-solid-state Dye-Sensitized Solar Cell.
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a stable quasi solid state dye sensitized Solar Cell with an amphiphilic ruthenium sensitizer and polymer gel electrolyte
Nature Materials, 2003Co-Authors: Peng Wang, Takashi Sekiguchi, Jacquese Moser, Shaik M Zakeeruddin, Mohammad Khaja Nazeeruddin, Michael GratzelAbstract:A stable quasi-solid-state Dye-Sensitized Solar Cell with an amphiphilic ruthenium sensitizer and polymer gel electrolyte
Jae Sung Song - One of the best experts on this subject based on the ideXlab platform.
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performance variation of carbon counter electrode based dye sensitized Solar Cell
Solar Energy Materials and Solar Cells, 2008Co-Authors: Easwaramoorthi Ramasamy, Jae Sung SongAbstract:The effect of dark and room temperature aging on the performance of carbon counter electrode based Dye-Sensitized Solar Cell (DSSC) has been investigated. Using nano size carbon as a counter electrode material, DSSC with power conversion efficiency of 7.56% was fabricated. Storing the devices in the dark at room temperature enhanced both the open-circuit voltage (VOC) and fill-factor (FF) but reduced the short-circuit current density (JSC). After 60 days of aging, carbon counter electrode DSSC retains 84% of its initial day efficiency (η). The variation in the current–voltage parameters was explained on the basis of electrochemical impedance spectroscopic (EIS) analysis.
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grid type dye sensitized Solar Cell module with carbon counter electrode
Journal of Photochemistry and Photobiology A-chemistry, 2008Co-Authors: Easwaramoorthi Ramasamy, Jae Sung SongAbstract:Abstract To realize low cost, high-performance Dye-Sensitized Solar Cell (DSSC) technology on industrial scale, large area grid type DSSC module has been prepared on silver grid-embedded transparent conducting glass substrate. Commercial titanium dioxide (TiO 2 ) and carbon powders were employed to make working and counter electrodes, respectively. Under simulated Solar light (AM 1.5, P in : 100 mW cm −2 ), 5 cm × 5 cm size carbon counter electrode module with an active area of 11.2 cm 2 shows V OC : 0.730 V, I SC : 118 mA, FF: 0.55 with 4.23% active area efficiency, which is comparable to 5.26% of platinum counter electrode module.
Yunfang Huang - One of the best experts on this subject based on the ideXlab platform.
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natural dyes as photosensitizers for dye sensitized Solar Cell
Solar Energy, 2006Co-Authors: Jihuai Wu, Yunfang HuangAbstract:Abstract The Dye-Sensitized Solar Cells (DSC) were assembled by using natural dyes extracted from black rice, capsicum, erythrina variegata flower, rosa xanthina, and kelp as sensitizers. The I SC from 1.142 mA to 0.225 mA, the V OC from 0.551 V to 0.412 V, the fill factor from 0.52 to 0.63, and P max from 58 μW to 327 μW were obtained from the DSC sensitized with natural dye extracts. In the extracts of natural fruit, leaves and flower chosen, the black rice extract performed the best photosensitized effect, which was due to the better interaction between the carbonyl and hydroxyl groups of anthocyanin molecule on black rice extract and the surface of TiO 2 porous film. The blue-shift of absorption wavelength of the black rice extract in ethanol solution on TiO 2 film and the blue-shift phenomenon from absorption spectrum to photoaction spectrum of DSC sensitized with black rice extract are discussed in the paper. Because of the simple preparation technique, widely available and low cheap cost natural dye as an alternative sensitizer for Dye-Sensitized Solar Cell is promising.
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Gel polymer electrolyte based on poly(acrylonitrile-co-styrene) and a novel organic iodide salt for quasi-solid state Dye-Sensitized Solar Cell
Electrochimica Acta, 2006Co-Authors: Zhang Lan, Yunfang Huang, Jianming Lin, Dongbo Wang, Sancun Hao, Shu Yin, Tsugio SatoAbstract:Abstract A gel polymer electrolyte based on poly(acrylonitrile- co -styrene) as polymer matrix and N -methyl pyridine iodide salt as I − source was prepared. Controlling the concentration of polymer matrix of poly(acrylonitrile- co -styrene) at 17.5 wt.%, mixing the binary organic solvents mixture ethylene carbonate and propylene carbonate with 6:4 (w/w), and the concentration of N -methyl pyridine iodide and iodine with 0.5 and 0.05 M, respectively, the gel polymer electrolyte attains the maximum ionic conductivity (at 30 °C) of 4.63 mS cm −1 . Based on the gel polymer electrolyte, a quasi-solid state Dye-Sensitized Solar Cell was fabricated and its overall energy conversion efficiency of light-to-electricity of 3.10% was achieved under irradiation of 100 mW cm −2 .
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the influence of acid treatment of tio2 porous film electrode on photoelectric performance of dye sensitized Solar Cell
Solar Energy, 2004Co-Authors: Jihuai Wu, Yunfang HuangAbstract:A Dye-Sensitized Solar Cell (DYSC) was assembled by adsorbing cis-dithiocyanato-bis (2,2′-bipyridyl-4,4′-dicarboxylate) ruthenium (II) onto TiO2 porous film. The influence of acid treatment of TiO2 electrode with different kinds and concentrations on the photoelectric performance of DYSC was investigated. It was found that DYSC had better photoelectric performance when the TiO2 electrode was treated by hydrochloric acid than that by sulfuric acid, nitric acid and phosphoric acid. When the concentration of hydrochloric acid to treat TiO2 electrode increases from 0 to 0.10 M, the fill factor of DYSC increases, the short-circuit current decreases, the open-circuit photovoltage increases and the absorption amount for TiO2 porous film to dye molecules decreases. The acid treatment of TiO2 electrode provides useful information on the mechanism of energy conversion of DYSC.
Kongjia Wang - One of the best experts on this subject based on the ideXlab platform.
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microstructure design of nanoporous tio2 photoelectrodes for dye sensitized Solar Cell modules
Journal of Physical Chemistry B, 2007Co-Authors: Linhua Hu, Shangfeng Xiao, Shuanghong Chen, And Linyun Liang, Fantai Kong, Jian Weng, Yang Huang, Kongjia WangAbstract:The optimization of Dye-Sensitized Solar Cells, especially the design of nanoporous TiO2 film microstructure, is an urgent problem for high efficiency and future commercial applications. However, up to now, little attention has been focused on the design of nanoporous TiO2 microstructure for a high efficiency of Dye-Sensitized Solar Cell modules. The optimization and design of TiO2 photoelectrode microstructure are discussed in this paper. TiO2 photoelectrodes with three different layers, including layers of small pore size films, larger pore size films, and light-scattering particles on the conducting glass with the desirable thickness, were designed and investigated. Moreover, the photovoltaic properties showed that the different porosities, pore size distribution, and BET surface area of each layer have a dramatic influence on short-circuit current, open-circuit voltage, and fill factor of the modules. The optimization and design of TiO2 photoelectrode microstructure contribute a high efficiency of DSC...
Easwaramoorthi Ramasamy - One of the best experts on this subject based on the ideXlab platform.
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performance variation of carbon counter electrode based dye sensitized Solar Cell
Solar Energy Materials and Solar Cells, 2008Co-Authors: Easwaramoorthi Ramasamy, Jae Sung SongAbstract:The effect of dark and room temperature aging on the performance of carbon counter electrode based Dye-Sensitized Solar Cell (DSSC) has been investigated. Using nano size carbon as a counter electrode material, DSSC with power conversion efficiency of 7.56% was fabricated. Storing the devices in the dark at room temperature enhanced both the open-circuit voltage (VOC) and fill-factor (FF) but reduced the short-circuit current density (JSC). After 60 days of aging, carbon counter electrode DSSC retains 84% of its initial day efficiency (η). The variation in the current–voltage parameters was explained on the basis of electrochemical impedance spectroscopic (EIS) analysis.
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grid type dye sensitized Solar Cell module with carbon counter electrode
Journal of Photochemistry and Photobiology A-chemistry, 2008Co-Authors: Easwaramoorthi Ramasamy, Jae Sung SongAbstract:Abstract To realize low cost, high-performance Dye-Sensitized Solar Cell (DSSC) technology on industrial scale, large area grid type DSSC module has been prepared on silver grid-embedded transparent conducting glass substrate. Commercial titanium dioxide (TiO 2 ) and carbon powders were employed to make working and counter electrodes, respectively. Under simulated Solar light (AM 1.5, P in : 100 mW cm −2 ), 5 cm × 5 cm size carbon counter electrode module with an active area of 11.2 cm 2 shows V OC : 0.730 V, I SC : 118 mA, FF: 0.55 with 4.23% active area efficiency, which is comparable to 5.26% of platinum counter electrode module.
