The Experts below are selected from a list of 3978 Experts worldwide ranked by ideXlab platform
Thomas Graule - One of the best experts on this subject based on the ideXlab platform.
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low temperature roll to roll coating procedure of dye sensitized solar cell photoelectrodes on flexible polymer based substrates
Semiconductor Science and Technology, 2011Co-Authors: Jean-claude Tinguely, Renata Solarska, Thomas GrauleAbstract:A new approach for the large-scale production of flexible photoelectrodes for dye-sensitized solar cells (DSSCs) is presented by roll-to-roll coating of a titanium dioxide nanodispersion containing the block copolymer 'Pluronic®' (PEOx-PPOy-PEOx, PEO: poly(ethylene oxide), PPO: poly(propylene oxide)). Functional DSSCs were assembled and the different coating procedures compared with respect to their solar power conversion efficiency. It is shown that the binder 'Pluronic' can be removed at processing temperatures as low as 140 °C, thus aiding achievement of sufficient adhesion to the ITO-PET support, higher porosity of the TiO2 layer and decreased Crack Appearance. Further optimization of this method is particularly promising when combined with other known low-temperature methods.
Marek Krawczuk - One of the best experts on this subject based on the ideXlab platform.
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the dynamic analysis of a Cracked timoshenko beam by the spectral element method
Journal of Sound and Vibration, 2003Co-Authors: Marek Krawczuk, Magdalena Palacz, Wieslaw OstachowiczAbstract:The aim of this paper is to introduce a new finite spectral element of a Cracked Timoshenko beam for modal and elastic wave propagation analysis. The proposed approach deals with the spectral element method. This method is suitable for analyzing wave propagation problems as well as for calculating modal parameters of the structure. In the paper, the results of the change in modal parameters due to Crack Appearance are presented. The influence of the Crack parameters, especially of the changing location of the Crack, on the wave propagation is examined. Responses obtained at different points of the beam are presented. Proper analysis of these responses allows one to indicate the Crack location in a very precise way. This fact is very promising for the future work in the damage detection field.
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analysis of longitudinal wave propagation in a Cracked rod by the spectral element method
Computers & Structures, 2002Co-Authors: Magdalena Palacz, Marek KrawczukAbstract:The aim of this paper is to introduce a new finite spectral element of a Cracked rod for damage detection. The proposed approach deals with the spectral analysis method as a means of solving the wave propagation problems in structures. The change of the wave propagation process due to a Crack Appearance, is examined by comparing the differences between the responses from damaged and undamaged rods. The influence of the Crack growth for the wave propagation is also examined. The rod element was excited with different signals in order to determine the influence of the nature of the signal for the wave propagation process. The differences in the propagating waves allow to indicate the Crack location in a very precise way. This fact is very promising for the future work on the damage detection field.
Jean-claude Tinguely - One of the best experts on this subject based on the ideXlab platform.
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low temperature roll to roll coating procedure of dye sensitized solar cell photoelectrodes on flexible polymer based substrates
Semiconductor Science and Technology, 2011Co-Authors: Jean-claude Tinguely, Renata Solarska, Thomas GrauleAbstract:A new approach for the large-scale production of flexible photoelectrodes for dye-sensitized solar cells (DSSCs) is presented by roll-to-roll coating of a titanium dioxide nanodispersion containing the block copolymer 'Pluronic®' (PEOx-PPOy-PEOx, PEO: poly(ethylene oxide), PPO: poly(propylene oxide)). Functional DSSCs were assembled and the different coating procedures compared with respect to their solar power conversion efficiency. It is shown that the binder 'Pluronic' can be removed at processing temperatures as low as 140 °C, thus aiding achievement of sufficient adhesion to the ITO-PET support, higher porosity of the TiO2 layer and decreased Crack Appearance. Further optimization of this method is particularly promising when combined with other known low-temperature methods.
Magdalena Palacz - One of the best experts on this subject based on the ideXlab platform.
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the dynamic analysis of a Cracked timoshenko beam by the spectral element method
Journal of Sound and Vibration, 2003Co-Authors: Marek Krawczuk, Magdalena Palacz, Wieslaw OstachowiczAbstract:The aim of this paper is to introduce a new finite spectral element of a Cracked Timoshenko beam for modal and elastic wave propagation analysis. The proposed approach deals with the spectral element method. This method is suitable for analyzing wave propagation problems as well as for calculating modal parameters of the structure. In the paper, the results of the change in modal parameters due to Crack Appearance are presented. The influence of the Crack parameters, especially of the changing location of the Crack, on the wave propagation is examined. Responses obtained at different points of the beam are presented. Proper analysis of these responses allows one to indicate the Crack location in a very precise way. This fact is very promising for the future work in the damage detection field.
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analysis of longitudinal wave propagation in a Cracked rod by the spectral element method
Computers & Structures, 2002Co-Authors: Magdalena Palacz, Marek KrawczukAbstract:The aim of this paper is to introduce a new finite spectral element of a Cracked rod for damage detection. The proposed approach deals with the spectral analysis method as a means of solving the wave propagation problems in structures. The change of the wave propagation process due to a Crack Appearance, is examined by comparing the differences between the responses from damaged and undamaged rods. The influence of the Crack growth for the wave propagation is also examined. The rod element was excited with different signals in order to determine the influence of the nature of the signal for the wave propagation process. The differences in the propagating waves allow to indicate the Crack location in a very precise way. This fact is very promising for the future work on the damage detection field.
A. Belyaev - One of the best experts on this subject based on the ideXlab platform.
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Yield enhancement for solar cell manufacturing using resonance Ultrasonic vibrations inspection
2009 34th IEEE Photovoltaic Specialists Conference (PVSC), 2009Co-Authors: A. Belyaev, Yu. Emirov, S. Ostapenko, I. Tarasov, V. Verstraten, M. Van Dooren, P.g. Fumei, G. Van Veghel, P. Bentz, A. Van Der HeideAbstract:Resonance Ultrasonic vibrations (RUV) methodology was developed and applied to access mechanical quality of crystalline silicon wafers and solar cells. RUV approach is based on fast non-destructive measurement of specific resonance vibration mode generated in the tested object using external ultrasonic transducer. Crack introduced into the object alters the resonance properties of the mode and allows sensitive diagnostics of the Crack Appearance. The paper describes our recent results of applying RUV method at industrial environment with objective to reduce a breakage rate in solar cell and solar module lines.
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Crack detection and analyses using resonance ultrasonic vibrations in full size crystalline silicon wafers
Applied Physics Letters, 2006Co-Authors: A. Belyaev, S. Ostapenko, O Polupan, W Dallas, D Hess, John H WohlgemuthAbstract:An experimental approach for fast Crack detection and length determination in full-size solar-grade crystalline silicon wafers using a resonance ultrasonic vibrations (RUV) technique is presented. The RUV method is based on excitation of the longitudinal ultrasonic vibrations in full-size wafers. Using an external piezoelectric transducer combined with a high sensitivity ultrasonic probe and computer controlled data acquisition system, real-time frequency response analysis can be accomplished. On a set of identical crystalline Si wafers with artificially introduced periphery Cracks, it was demonstrated that the Crack results in a frequency shift in a selected RUV peak to a lower frequency and increases the resonance peak bandwidth. Both characteristics were found to increase with the length of the Crack. The frequency shift and bandwidth increase serve as reliable indicators of the Crack Appearance in silicon wafers and are suitable for mechanical quality control and fast wafer inspection.
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Crack detection and analyses using resonance ultrasonic vibrations in full size crystalline silicon wafers
Solid State Phenomena, 2005Co-Authors: A. Belyaev, S. Ostapenko, O Polupan, W Dallas, D Hess, John H WohlgemuthAbstract:An experimental approach for fast Crack detection and length determination in fullsize solar-grade crystalline silicon wafers using a Resonance Ultrasonic Vibrations (RUV) technique is presented. The RUV method is based on excitation of the longitudinal ultrasonic vibrations in full-size wafers. Using an external piezoelectric transducer combined with a high sensitivity ultrasonic probe and computer controlled data acquisition system, real-time frequency response analysis can be accomplished. On a set of identical crystalline Si wafers with artificially introduced periphery Cracks, it was demonstrated that the Crack results in a frequency shift in a selected RUV peak to a lower frequency and increases the resonance peak band width. Both characteristics were found to increase with the length of the Crack. The frequency shift and bandwidth serve as reliable indicators of the Crack Appearance in silicon wafers and are suitable for mechanical quality control and fast wafer inspection.
