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90 results on '"Liska, Paul"'

1. Low-temperature Fabrication of Highly-Efficient, Optically-Transparent (FTO-free) Graphene Cathode for Co-Mediated Dye-Sensitized Solar Cells with Acetonitrile-free Electrolyte Solution

Author

Kavan, Ladislav, Liska, Paul, Zakeeruddin, Shaik M., and Grätzel, Michael

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

Propionitrile electrolyte solutions mixed with sulfolane or with 1-ethyl 3-methyl imidazolium tetracyanoborate (ionic liquid) are optimized for Co(bpy)3+/Co(bpy)2+-mediated DSCs working at low illumination intensity.

Published
2018
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5. A round robin study of flexible large-area roll-to-roll processed polymer solar cell modules

Author

Krebs, Frederik C., Gevorgyan, Suren A., Gholamkhass, Bobak, Holdcroft, Steven, Schlenker, Cody, Thompson, Mark E., Thompson, Barry C., Olson, Dana, Ginley, David S., Shaheen, Sean E., Alshareef, Husam N., Murphy, John W., Youngblood, W. Justin, Heston, Nathan C., Reynolds, John R., Jia, Shijun, Laird, Darin, Tuladhar, Sachetan M., Dane, Justin G.A., Atienzar, Pedro, Nelson, Jenny, Kroon, Jan M., Wienk, Martijn M., Janssen, René A.J., Tvingstedt, Kristofer, Zhang, Fengling, Andersson, Mattias, Inganäs, Olle, Lira-Cantu, Monica, de Bettignies, Rémi, Guillerez, Stéphane, Aernouts, Tom, Cheyns, David, Lutsen, Laurence, Zimmermann, Birger, Würfel, Uli, Niggemann, Michael, Schleiermacher, Hans-Frieder, Liska, Paul, Grätzel, Michael, Lianos, Panagiotis, Katz, Eugene A., Lohwasser, Wolfgang, and Jannon, Bertrand

Published
2009
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8. Combined experimental and DFT-TDDFT computational study of photoelectrochemical cell ruthenium sensitizers

Author

Nazeeruddin, Mohammad K., Angelis, Filippo De, Fantacci, Simona, Selloni, Annabella, Viscardi, Guido, Liska, Paul, Seigo Ito, Gratzel, Michael, and Takeru, Bessho

Subjects
Density functionals -- Usage, Ruthenium -- Chemical properties, Sensors -- Design and construction, Solar batteries -- Design and construction, Solar cells -- Design and construction, Chemistry
Abstract

It presents a combined experimental and computational study of several ruthenium(II) sensitizers originated from the [Ru(dcbpyH(sub 2))(sub 2)(NCS)(sub 2)], N3, and [Ru(dcbpyH(sub 2))(tdbpy)(NCS)(sub 2)], N621, (dcbpyH(sub 2) = 4,4'-dicaboxy-2,2'-bipyridine, tdbpy = 4,4'-tridecyl-2,2'-bipyridine) complexes, an extensive Density Functional Theory (DFT)-Time Dependent DFT study of these sensitizers in solution was performed. Obtained theoretical result on the role of protnation in the interacting dye-semiconductor systems is in progress.

Published
2005

9. The Electronic Role of the TiO 2 Light-Scattering Layer in Dye-Sensitized Solar Cells

Author

Zhang, Zhipan, primary, Ito, Seigo, additional, O’Regan, Brian, additional, Kuang, Daibin, additional, Zakeeruddin, Shaik Mohammed, additional, Liska, Paul, additional, Charvet, Raphaël, additional, Comte, Pascal, additional, Nazeeruddin, Mohammad Khaja, additional, Péchy, Peter, additional, Humphry-Baker, Robin, additional, Koyanagi, Tsuguo, additional, Mizuno, Takaki, additional, and Grätzel, Michael, additional

Published
2018
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10. DFT-INDO/S modeling of new high molar extinction coefficient charge-transfer sensitizers for solar cell applications

Author

Nazeeruddin, Mohammad K., Qing Wang, Cevey, Le, Aranyos, Viviane, Liska, Paul, Figgemeier, Egbert, Klein, Cedric, Hirata, Narukuni, Koops, Sara, Haque, Saif A., Durrant, James R., Hagfeldt, Anders, Lever, A.B.P., and Gratzel, Michael

Subjects
Solar batteries -- Research, Solar cells -- Research, Density functionals -- Usage, Ruthenium -- Chemical properties, Ruthenium -- Structure, Transition metal complexes -- Structure, Transition metal complexes -- Chemical properties, Chemistry
Abstract

The selective functionalization of a ruthenium complex, resulting in red-shifted absorption spectra and enhanced molar extinction coefficient of the sensitizer is demonstrated. The finding allows creation of directionality in the excited state of sensitizer by adjusting the electron densities of the donor moieties that are not attached to the TiO(sub 2) surface.

Published
2006

12. Dye-sensitized solar cells for efficient power generation under ambient lighting

Author

Freitag, Marina, Teuscher, Joel, Saygili, Yasemin, Zhang, Xiaoyu, Giordano, Fabrizio, Liska, Paul, Hua, Jianli, Zakeeruddin, Shaik M., Moser, Jacques-E., Grätzel, Michael, Hagfeldt, Anders, Freitag, Marina, Teuscher, Joel, Saygili, Yasemin, Zhang, Xiaoyu, Giordano, Fabrizio, Liska, Paul, Hua, Jianli, Zakeeruddin, Shaik M., Moser, Jacques-E., Grätzel, Michael, and Hagfeldt, Anders

Abstract

Solar cells that operate efficiently under indoor lighting are of great practical interest as they can serve as electric power sources for portable electronics and devices for wireless sensor networks or the Internet of Things. Here, we demonstrate a dye-sensitized solar cell (DSC) that achieves very high power-conversion efficiencies (PCEs) under ambient light conditions. Our photosystem combines two judiciously designed sensitizers, coded D35 and XY1, with the copper complex Cu(II/I)(tmby) as a redox shuttle (tmby, 4,4', 6,6'-tetramethyl-2,2'-bipyridine), and features a high open-circuit photovoltage of 1.1 V. The DSC achieves an external quantum efficiency for photocurrent generation that exceeds 90% across the whole visible domain from 400 to 650 nm, and achieves power outputs of 15.6 and 88.5 mu W cm(-2) at 200 and 1,000 lux, respectively, under illumination from a model Osram 930 warm-white fluorescent light tube. This translates into a PCE of 28.9%.

Published
2017
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13. Electron-Density and Electron-Lifetime Profile in Nanocrystalline-TiO2 Electrode of Dye-Sensitized Solar Cells Analysed by Voltage Decay and Charge Extraction

Author

Ito, Seigo, Humphry-Baker, Robin, Liska, Paul, Comte, Pascal, Péchy, Peter, Nazeeruddin, Mohammad K., and Grätzel, Michael

Subjects
Article Subject
Abstract

The dependence of the electron density and electron lifetime in nanocrystalline-TiO2 electrode on the electron back reaction with I3− in a dye-sensitized solar cell, based on a mesoporous titania (TiO2) matrix immersed in an iodine-based electrolyte, has been presented by analyzing the results of voltage decay and charge extraction measurements without modelling, without interpretation of mechanism, and without complicating calculations. This new analysis approach utilizes simple equations and basic definition of kinetics, concluding in absolute electron-density and charge-lifetime measurements. The relation of electron lifetime to open-circuit voltage indicates a peak of the long-lifetime charge at 5.5 V, which is consistent with the information of middle band suggested by Bisquert et al. (2004).

Published
2011
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16. A round robin study of flexible large-area roll-to-roll processed polymer solar cell modules

Author

Krebs, Frederik C, Gevorgyan, Suren A, Gholamkhass, Bobak, Holdcroft, Steven, Schlenker, Cody, Thompson, Mark E, Thompson, Barry C, Olson, Dana, Ginley, David S, Shaheen, Sean E, Alshareef, Husam N, Murphy, John W, Youngblood, W Justin, Heston, Nathan C, Reynolds, John R, Jia, Shijun, Laird, Darin, Tuladhar, Sachetan M, Dane, Justin G A, Atienzar, Pedro, Nelson, Jenny, Kroon, Jan M, Wienk, Martijn M, Janssen, Rene A J, Tvingstedt, Kristofer, Zhang, Fengling, Andersson, Mattias, Inganäs, Olle, Lira-Cantu, Monica, de Bettignies, Remi, Guillerez, Stephane, Aernouts, Tom, Cheyns, David, Lutsen, Laurence, Zimmermann, Birger, Wuerfel, Uli, Niggemann, Michael, Schleiermacher, Hans-Frieder, Liska, Paul, Graetzel, Michael, Lianos, Panagiotis, Katz, Eugene A, Lohwasser, Wolfgang, Jannon, Bertrand, Krebs, Frederik C, Gevorgyan, Suren A, Gholamkhass, Bobak, Holdcroft, Steven, Schlenker, Cody, Thompson, Mark E, Thompson, Barry C, Olson, Dana, Ginley, David S, Shaheen, Sean E, Alshareef, Husam N, Murphy, John W, Youngblood, W Justin, Heston, Nathan C, Reynolds, John R, Jia, Shijun, Laird, Darin, Tuladhar, Sachetan M, Dane, Justin G A, Atienzar, Pedro, Nelson, Jenny, Kroon, Jan M, Wienk, Martijn M, Janssen, Rene A J, Tvingstedt, Kristofer, Zhang, Fengling, Andersson, Mattias, Inganäs, Olle, Lira-Cantu, Monica, de Bettignies, Remi, Guillerez, Stephane, Aernouts, Tom, Cheyns, David, Lutsen, Laurence, Zimmermann, Birger, Wuerfel, Uli, Niggemann, Michael, Schleiermacher, Hans-Frieder, Liska, Paul, Graetzel, Michael, Lianos, Panagiotis, Katz, Eugene A, Lohwasser, Wolfgang, and Jannon, Bertrand

Abstract

A round robin for the performance of roll-to-roll coated flexible large-area polymer solar-cell modules involving 18 different laboratories in Northern America, Europe and Middle East is presented. The study involved the performance measurement of the devices at one location (Riso DTU) followed by transportation to a participating laboratory for performance measurement and return to the starting location (Riso DTU) for re-measurement of the performance. It was found possible to package polymer solar-cell modules using a flexible plastic barrier material in such a manner that degradation of the devices played a relatively small role in the experiment that has taken place over 4 months. The method of transportation followed both air-mail and surface-mail paths.

Published
2009
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17. Utilization of Direct and Diffuse Sunlight in a Dye-Sensitized Solar Cell — Silicon Photovoltaic Hybrid Concentrator System

Author

Barber, Greg D., primary, Hoertz, Paul G., additional, Lee, Seung-Hyun Anna, additional, Abrams, Neal M., additional, Mikulca, Janine, additional, Mallouk, Thomas E., additional, Liska, Paul, additional, Zakeeruddin, Shaik M., additional, Grätzel, Michael, additional, Ho-Baillie, Anita, additional, and Green, Martin A., additional

Published
2011
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22. The Electronic Role of the TiO2 Light-Scattering Layer in Dye-Sensitized Solar Cells

Author

Zhang, Zhipan, primary, Ito, Seigo, additional, O'Regan, Brian, additional, Kuang, Daibin, additional, Zakeeruddin, Shaik Mohammed, additional, Liska, Paul, additional, Charvet, Raphaël, additional, Comte, Pascal, additional, Nazeeruddin, Mohammad Khaja, additional, Péchy, Peter, additional, Humphry-Baker, Robin, additional, Koyanagi, Tsuguo, additional, Mizuno, Takaki, additional, and Grätzel, Michael, additional

Published
2007
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25. DFT-INDO/S Modeling of New High Molar Extinction Coefficient Charge-Transfer Sensitizers for Solar Cell Applications

Author

Nazeeruddin, Mohammad K., primary, Wang, Qing, additional, Cevey, Le, additional, Aranyos, Viviane, additional, Liska, Paul, additional, Figgemeier, Egbert, additional, Klein, Cedric, additional, Hirata, Narukuni, additional, Koops, Sara, additional, Haque, Saif A., additional, Durrant, James R., additional, Hagfeldt, Anders, additional, Lever, A. B. P., additional, and Grätzel, Michael, additional

Published
2005
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30. Engineering of efficient panchromatic sensitizes for nanocrystalline TiO2-based solar cells

Author

Nazeeruddin, Mohammad K., Pechy, Peter, Renouard, Thierry, Zakeeruddin, Shaik M., Humphry-Baker, Robin, Comet, Pascal, Liska, Paul, Cevey, Le, Costa, Emiliana, Shklover, Valery, Spiccia, Leone, Deacon, Glen B., Bignozzi, Carlo A., and Gratzel, Michael

Subjects
Ruthenium -- Research, Solar cells -- Research, Chemistry
Abstract

A new range of panchromatic ruthenium(II) sensitizers have been developed, derived from carboxylated terpyridyl compounds of tris-thicyanato Ru(II).

Published
2001

32. Electron-Density and Electron-Lifetime Profile in Nanocrystalline-TiO2 Electrode of Dye-Sensitized Solar Cells Analysed by Voltage Decay and Charge Extraction.

Author

Ito, Seigo, Humphry-Baker, Robin, Liska, Paul, Comte, Pascal, Péchy, Peter, Nazeeruddin, Mohammad K., and Grätzel, Michael

Subjects
ELECTRON distribution, ELECTRONS, EQUATIONS, NUMERICAL analysis, ELECTROLYTES
Abstract

The dependence of the electron density and electron lifetime in nanocrystalline-TiO2 electrode on the electron back reaction with Due to image rights restrictions, multiple line equation(s) cannot be graphically displayed. in a dye-sensitized solar cell, based on a mesoporous titania (TiO2) matrix immersed in an iodine-based electrolyte, has been presented by analyzing the results of voltage decay and charge extraction measurements without modelling, without interpretation of mechanism, and without complicating calculations. This new analysis approach utilizes simple equations and basic definition of kinetics, concluding in absolute electron-density and charge-lifetime measurements. The relation of electron lifetime to open-circuit voltage indicates a peak of the long-lifetime charge at 5.5V, which is consistent with the information of middle band suggested by Bisquert et al. (2004) . [ABSTRACT FROM AUTHOR]

Published
2011
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37. The Electronic Role of the TiO2Light-Scattering Layer in Dye-Sensitized Solar Cells

Author

Zhang, Zhipan, Ito, Seigo, O'Regan, Brian, Kuang, Daibin, Zakeeruddin, Shaik Mohammed, Liska, Paul, Charvet, Raphaël, Comte, Pascal, Nazeeruddin, Mohammad Khaja, Péchy, Peter, Humphry-Baker, Robin, Koyanagi, Tsuguo, Mizuno, Takaki, and Grätzel, Michael

Abstract

Dye-sensitized solar cells have been fabricated with different kinds of TiO2films including SiO2coated and bare TiO2microparticles as light-scattering layer (LSL). Results show that the LSL barely affects the cell's dark current, whereas under illumination, it made a significant contribution to the total photocurrent. Photo-voltage decay measurements performed under bias illumination show the density of electronic states (DOS) of the LSL to be two times smaller than that of a transparent nanoparticle layer (TNL). Strikingly, DSCs fabricated from a 4.5μm thick LSL alone showed a conversion efficiency of 5% despite of being pale pink in color. This impressive performance is attributed to light containment in the LSL and a low density of defect electronic states.

Published
2007
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38. Acid versusbase peptization of mesoporous nanocrystalline TiO2films: functional studies in dye sensitized solar cellsElectronic supplementary information (ESI) available: XRD data for nanocrystalline TiO2. See http://www.rsc.org/suppdata/jm/b4/b407963a/

Author

Hore, Sarmimala, Palomares, Emilio, Smit, Herman, Bakker, Nicolaas J., Comte, Pascal, Liska, Paul, Thampi, K. Ravindranathan, Kroon, Jan M., Hinsch, Andreas, and Durrant, James R.

Abstract

We report an analysis of the influence of acidbase conditions employed in the synthesis of TiO2nanoparticles upon the performance of dye sensitised photoelectrochemical solar cells fabricated from these particles. The functional properties of the TiO2nanoparticles in these devices are investigated by potential step chronoamperometry, transient laser spectroscopy, and photovoltaic device characterisation. We find that base peptization conditions employed in the sol–gel fabrication of the TiO2nanoparticles result in a reduction in film electron density under negative applied bias, correlated with slower interfacial recombination losses and a higher device open circuit voltage.

Published
2005
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39. High-efficiency (7.2%) flexible dye-sensitized solar cells with Ti-metal substrate for nanocrystalline-TiO2photoanode

Author

Ito, Seigo, Ha, Ngoc-Le Cevey, Rothenberger, Guido, Liska, Paul, Comte, Pascal, Zakeeruddin, Shaik M., Péchy, Péter, Nazeeruddin, Mohammad Khaja, and Grätzel, Michael

Abstract

High-efficiency flexible dye-sensitized solar cells were fabricated with a Ti-metal foil substrate for photo anode and using a Pt-electrodeposited counter electrode on ITO/polyethylene naphthalate (ITO/PEN); these devices were characterized by incident photon-to-current efficiency (IPCE), optical transmittance and electrical impedance spectroscopy.

Published
2006
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45. Dye-sensitized solar cells for efficient power generation under ambient lighting

Author

Freitag, Marina, Teuscher, Joël, Saygili, Yasemin, Zhang, Xiaoyu, Giordano, Fabrizio, Liska, Paul, Hua, Jianli, Zakeeruddin, Shaik M., Moser, Jacques-E., Grätzel, Michael, and Hagfeldt, Anders

Abstract

Solar cells that operate efficiently under indoor lighting are of great practical interest as they can serve as electric power sources for portable electronics and devices for wireless sensor networks or the Internet of Things. Here, we demonstrate a dye-sensitized solar cell (DSC) that achieves very high power-conversion efficiencies (PCEs) under ambient light conditions. Our photosystem combines two judiciously designed sensitizers, coded D35 and XY1, with the copper complex Cu(II/I)(tmby) as a redox shuttle (tmby, 4,4′,6,6′-tetramethyl-2,2′-bipyridine), and features a high open-circuit photovoltage of 1.1 V. The DSC achieves an external quantum efficiency for photocurrent generation that exceeds 90% across the whole visible domain from 400 to 650 nm, and achieves power outputs of 15.6 and 88.5 mW cm–2 at 200 and 1,000 lux, respectively, under illumination from a model Osram 930 warm-white fluorescent light tube. This translates into a PCE of 28.9%.

46. Optically Transparent FTO-Free Cathode for Dye-Sensitized Solar Cells

Author

Kavan, Ladislav, Liska, Paul, Zakeeruddin, Shaik M., and Graetzel, Michael

Subjects
woven fabric, electrochemical impedance spectroscopy, dye-sensitized solar cell, tungsten electrode
Abstract

The woven fabric containing electrochemically platinized tungsten wire is an affordable flexible cathode for liquid-junction dye-sensitized solar cells with the I-3(-)/I- redox mediator and electrolyte solution consisting of ionic liquids and propionitrile. The fabric-based electrode outperforms the thermally platinized FTO in serial ohmic resistance and charge-transfer resistance for triiodide reduction, and it offers comparable or better optical transparency in the visible and particularly in the near-IR spectral region. The electrode exhibits good stability during electrochemical loading and storage at open circuit. The dye-sensitized solar cells with a C101-sensitized titania photoanode and either PtW/PEN or PtFTO cathodes show a comparable performance.

48. Tandem photovoltaic conversion device

Author

Graetzel, Michael, Liska, Paul, Thampi, Ravindranathan, and Comte, Pascal

Subjects
TTO:5.0023
Abstract

The tandem photovoltaic conversion device comprises at least one top photovoltaic cell unit and one bottom photovoltaic cell unit laminated along a light transmitting direction and electrically connected, wherein said top cell unit is a dye sensitised or semiconductor nanoparticle solar cell and wherein said bottom cell unit is selected among p-n junction semiconductor based cells.

49. High-conversion-efficiency organic dye-sensitized solar cells with a novel indoline dye

Author

Ito, Seigo, Miura, Hidetoshi, Uchida, Satoshi, Takata, Masakazu, Sumioka, Koichi, Liska, Paul, Comte, Pascal, Pechy, Peter, and Graetzel, Michael

Subjects
Enhancement, Tio2 Films, Acid, Photosensitization, Derivatives
Abstract

An indoline dye (D205), the synthesis method of which is disclosed in this report, gave high-efficiency organic dye-sensitized solar cells (9.52%) using an anti-aggregation reagent (chenodeoxycholic acid).

50. Bifacial dye-sensitized solar cells based on an ionic liquid electrolyte

Author

Ito, Seigo, Zakeeruddin, Shaik M., Comte, Pascal, Liska, Paul, Kuang, Daibin, and Graetzel, Michael

Subjects
Conversion Efficiency, Cost, Tio2 Films, Oxide, Nanoparticles, Gel Electrolytes, High-Efficiency, Substrate, Front
Abstract

Solar energy is a promising solution to global energy-related problems because it is clean, inexhaustible and readily available. However, the deployment of conventional photovoltaic cells based on silicon is still limited by cost, so alternative, more cost-effective approaches are sought. Here we report a bifacial dye-sensitized solar cell structure that provides high photo-energy conversion efficiency (similar to 6%) for incident light striking its front or rear surfaces. The design comprises a highly stable ruthenium dye ( Z907Na) in combination with an ionic-liquid electrolyte and a porous TiO2 layer. The inclusion of a SiO2 layer between the electrodes to prevent generation of unwanted back current and optimization of the thickness of the TiO2 layer are responsible for the enhanced performance.

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