Dr. Agnes Rivaton Profile

Dr. Agnes Rivaton

at Univ Blaise Pascal

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Author

Publications (9)

Proceedings Article | 16 October 2012 Paper

Combined characterization techniques to understand the stability of a variety of organic photovoltaic devices: the ISOS-3 inter-laboratory collaboration

Monica Lira-Cantu, David Tanenbaum, Kion Norrman, Eszter Voroshazi, Martin Hermenau, Matthew Lloyd, Gerardo Teran-Escobar, Yulia Galagan, Birger Zimmermann, Markus Hösel, Henrik Dam, Mikkel Jørgensen, Suren Gevorgyan, Laurence Lutsen, Dirk Vanderzande, Harald Hoppe, Roland Rösch, Uli Würfel, Ronn Andriessen, Agnès Rivaton, Gülşah Uzunoğlu, David Germack, Birgitta Andreasen, Morten Madsen, Eva Bundgaard, Frederik Krebs

Proceedings Volume 8472, 847203 (2012) https://doi.org/10.1117/12.929579

KEYWORDS: Silver, Solar cells, Quantum efficiency, Organic photovoltaics, Electrodes, Sun, Metals, Ions, Aluminum, Calibration

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Proceedings Article | 25 September 2012 Paper

Stability and degradation of organic photovoltaics fabricated, aged, and characterized by the ISOS 3 inter-laboratory collaboration

David Tanenbaum, Martin Hermenau, Eszter Voroshazi, Matthew Lloyd, Yulia Galagan, Birger Zimmermann, Markus Hösel, Henrik Dam, Mikkel Jørgensen, Suren Gevorgyan, Suleyman Kudret, Wouter Maes, Laurence Lutsen, Dirk Vanderzande, Uli Würfel, Ronn Andriessen, Roland Rösch, Harald Hoppe, Monica Lira-Cantu, Gerardo Teran-Escobar, Aurélie Dupuis, Pierre-Olivier Bussière, Agnès Rivaton, Gülsah Uzunoglu, David Germack, Birgitta Andreasen, Morten Madsen, Kion Norrman, Eva Bundgaard, Frederik Krebs

Proceedings Volume 8477, 847704 (2012) https://doi.org/10.1117/12.930451

KEYWORDS: Quantum efficiency, Sun, Organic photovoltaics, Luminescence, Electroluminescence, Atomic force microscopy, Electrodes, Oxygen, Ultraviolet radiation, Solar cells

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Proceedings Article | 8 May 2008 Paper

Impact of light on organic solar cells: evolution of the chemical structure, morphology, and photophysical properties of the active layer

Agnès Rivaton, Sylvain Chambon, Matthieu Manceau, Jean-Luc Gardette, Muriel Firon, Noëlla Lemaître, Stéphane Guillerez, Stéphane Cros

Proceedings Volume 7002, 70020I (2008) https://doi.org/10.1117/12.780564

KEYWORDS: Oxygen, Polymers, Absorbance, Organic photovoltaics, Solar cells, Absorption, Chemical analysis, Photolysis, Infrared spectroscopy, Oxidation

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Proceedings Article | 18 September 2007 Paper

Chemical photostructuration in iodoform-doped carbazolic copolymers for holographic recording

Ecaterina Chilat, Audrey Bodin, Sylvain Chambon, Lawrence Frezet, Agnès Rivaton, Stefan Robu, Michèle Bolte, Bénédicte Mailhot

Proceedings Volume 6657, 66570A (2007) https://doi.org/10.1117/12.736014

KEYWORDS: Polymers, Absorbance, Holography, Absorption, Infrared radiation, Holograms, Statistical analysis, Visible radiation, Gases, Oxidation

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Proceedings Article | 8 September 2006 Paper

Dichromated agar: a promising doped biocopolymer for real time holographic recording

Michèle Bolte, Yaël Israëli, Agnès Rivaton, Roger Lessard

Proceedings Volume 6343, 63432U (2006) https://doi.org/10.1117/12.707774

KEYWORDS: Holograms, Diffraction, Chromium, Polymers, Holography, Humidity, Modulation, Refractive index, Photosensitive materials, Spectroscopy

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Proceedings Article | 9 June 2006 Paper

Interactivity holography/photochemistry: how the combined approach helps understand and optimise the holographic recording

Michèle Bolte, Roger Lessard, Yaël Israeli, Agnès Rivaton

Proceedings Volume 6252, 625203 (2006) https://doi.org/10.1117/12.676495

KEYWORDS: Chromium, Polymers, Holograms, Holography, Spectroscopy, Diffraction, Quantum efficiency, Bridges, Potassium, Photosensitive materials

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A comparative investigation of the photochemical behavior of dichromated gelatin (DCG), dichromated polyacrylic acid (DCPAA) and dichromated polyvinylalcohol (DCPVA) gave evidence for the similarity of the photochemical behaviour involved when recording holograms in DCG and DCPVA. Chromium (V), the chromium species resulting from the photoredox process between the starting chromium (VI) (dichromate) and the polymeric chain, was stable likely strongly complexed in gelatine and polyvinylalcohol. The quantum yields of the reaction are high and similar for both reactions. On the contrary, even though chromium (V) was also formed during the primary process in DCPAA, this species was quite unstable and disappeared as soon as the irradiation was stopped. The behavior observed in DCG can be assigned to the presence of OH groups on the polymeric chain, these groups being the only groups present in polyvinylalcohol. Actually, the stability and the state of complexation of the different chromium species was completely opposite in the two matrices: the stabilization of chromium (V) resulting from the photochemical charge transfer in DCPVA, by complexation with PVA is in contrast to what was observed in DCPAA where chromium (V) was highly instable. Regarding chromium (III), the final reduction chromium species, it was complexed in PAA and not in PVA. The experiments performed on films of DC (PVA+PAA) with only a few percents of PAA gave evidence for the strong influence of the presence of the carboxylic groups on the photochemical behavior: the rate of the formation and the stability of chromium species that reflects the chelating properties of the polymeric matrix. The photochemical results were correlated to the results obtained when recording holograms in the corresponding material: a very nice agreement appeared between the two sets of results. An innovative approach combining the monitoring of the structural modification of the polymeric matrix and the fate of the various chromium species ((VI), (V) and (III)) was then implemented. For the first time, it was established that chromium (V) was at the origin of the cross-linking implied in the hologram formation by acting as a bridge between hydroxyl groups of the polymeric chains. A second unanswered question was also elucidated. The improvement brought by ammonium dichromate with respect to potassium dichromate involves amide groups as additional chelating sites for chromium (V) resulting in the increase of the matrix cross-linking.

Proceedings Article | 21 April 2005 Paper

Hologram formation reconsidered in dichromated polyvinylalcohol: polymer cross-linking around chromium (V)

Michele Bolte, Yael Israeli, Fatma Djouani, Agnes Rivaton, Lawrence Frezet, Roger Lessard

Proceedings Volume 5742, (2005) https://doi.org/10.1117/12.590395

KEYWORDS: Chromium, Polymers, Holograms, Absorption, Spectroscopy, Potassium, Bridges, Absorbance, Polymer thin films, Photosensitive materials

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Proceedings Article | 29 June 2004 Paper

Dichromated photosensitive materials: involvement of the polymeric matrix

Michele Bolte, Yael Israeli, Agnes Rivaton, Lawrence Frezet, Roger Lessard

Proceedings Volume 5290, (2004) https://doi.org/10.1117/12.529102

KEYWORDS: Polymers, Chromium, Absorbance, Absorption, Photosensitive materials, Holograms, Holography, Oxygen, Spectroscopy, Oxidation

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Proceedings Article | 8 December 2003 Paper

Fulgide-based WRE holographic materials: influence of the matrix on the fatigue process

Roger Lessard, Christophe Lafond, Geraldine Darderian, Jean-Luc Gardette, Agnes Rivaton, Michele Bolte

Proceedings Volume 5216, (2003) https://doi.org/10.1117/12.508323

KEYWORDS: Polymethylmethacrylate, Polymers, Holography, Ultraviolet radiation, Photosensitive materials, Absorption, Absorbance, Epoxies, Visible radiation, Holographic materials

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Showing 5 of 9 publications

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