Aurélien Tournebize

Institut de Chimie de Clermont-Ferrand

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Agnès Rivaton

Institut de Chimie de Clermont-Ferrand

Thomas Chassé

University of Tübingen

Heiko Peisert

University of Tübingen

Sylvain Chambon

Institut Polytechnique de Bordeaux

Lionel Hirsch

Université de Bordeaux

Jean‐Luc Gardette

Institut de Chimie de Clermont-Ferrand

Roger C. Hiorns

Centre National de la Recherche Scientifique

Guillaume Wantz

Laboratoire de l'Intégration du Matériau au Système

Giorgio Mattana

Université Paris Cité

Pierre‐Olivier Bussière

Institut de Chimie de Clermont-Ferrand

Cooperative Institutions

Centre National de la Recherche Scientifique

Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux

Université de Pau et des Pays de l'Adour

Université Clermont Auvergne

Institut Polytechnique de Bordeaux

Clermont Université

Université de Bordeaux

Institut de Chimie de Clermont-Ferrand

Laboratoire de l'Intégration du Matériau au Système

École Nationale Supérieure de Chimie de Montpellier

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Surface engineering of ITO electrode with a functional polymer for PEDOT:PSS-free organic solar cells

Organic Electronics (2018)

Hussein Awada Giorgio Mattana Aurélien Tournebize Laurent Rodriguez Delphine Flahaut

Indium tin oxide

10.1016/j.orgel.2018.03.004

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Citations (16)

Molecular orientation in polymer/fullerene blend films and the influence of annealing

Solar Energy Materials and Solar Cells (2014)

Umut Aygül Heiko Peisert David Batchelor Ulf Dettinger Milutin Ivanović

XANES

10.1016/j.solmat.2014.05.017

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Citations (15)

Impact of UV‐Visible Light on the Morphological and Photochemical Behavior of a Low‐Bandgap Poly(2,7‐Carbazole) Derivative for Use in High‐Performance Solar Cells

Advanced Energy Materials (2012)

Aurélien Tournebize Pierre‐Olivier Bussière Pascal Wong‐Wah‐Chung Sandrine Thérias Agnès Rivaton

Abstract This paper reports on the photochemical behavior upon exposure to UV‐visible light of a poly(2,7‐carbazole) derivative for use in high‐performance solar cells. Poly[ N ‐9′‐hepta‐decanyl‐2,7‐carbazole‐ alt ‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)] (PCDTBT) is one of a relatively large class of push‐pull carbazole‐based copolymers that have been synthesized to better harvest the solar spectrum. The 2,7‐carbazole building block of PCDTBT is also used with different electron‐accepting units in a large variety of low‐band‐gap polymers. The photochemical and morphological behavior of PCDTBT thin films is investigated from the molecular scale to the nanomechanical properties. The photo‐oxidation mechanism is shown to be governed by chain‐scission and cross‐linking reactions. It results in dramatic evolution of the morphology, roughness and stiffness of thin PCDTBT films. Based on the identification of several photoproducts formed along the macromolecular chains or released into the gas phase, the main pathways of PCDTBT photochemical evolution are discussed. These processes first involve the scission of the C–N bond between the carbazole group and the tertiary carbon atom bearing the alkyl side‐chain. Modifications of the chemical structure of PCDTBT, the evolution of its UV‐visible absorbance, and its nanomechanical properties initiated by light irradiation are shown to be closely related.

Carbazole

Visible spectrum

10.1002/aenm.201200662

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Citations (81)

Morphology and photochemical stability of P3HT:PCBM active layers of organic solar cells

The European Physical Journal Applied Physics (2011)

Aurélie Dupuis Aurélien Tournebize Pierre‐Olivier Bussière Agnès Rivaton Jean‐Luc Gardette

We report on the effects of continuous UV-visible light illumination at 60 °C in the absence of oxygen on P3HT:PCBM blend films commonly used active layer of bulk heterojunction solar cells. A full description of the behavior of P3HT:PCBM blend films either unconfined or confined by an Al cathode and a PEDOT:PSS layer during annealing treatment and irradiation is provided. We also focused on the impact of the P3HT type on the photostability. It was shown that the microstructure of P3HT dramatically influenced the photodegradation process of P3HT thin films deposited on inert substrate. The rate of photodegradation process was decreased when P3HT was blended with PCBM. It was shown that the photostability of the active layer was not influenced by a PEDOT-PSS sub-layer. Solar cells were then fabricated from high-regioregular P3HT. Many large PCBM crystals were observed in P3HT:PCBM blend films and it was shown that the top surface of the active layer in contact with the Al cathode was nearly entirely composed of P3HT. Both results account for the low performances of the devices. Finally, photo-aging experiments provoked a rapid failure of the Al cathodes which was tentatively attributed to an increase of internal strain within the devices.

Active layer

Photodegradation

Inert

10.1051/epjap/2011110132

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Citations (19)

Insight into the orientation of LBG polymer films by XANES experiment and calculation

European Polymer Journal (2016)

David Batchelor Umut Aygül Ulf Dettinger Milutin Ivanović Aurélien Tournebize

XANES

10.1016/j.eurpolymj.2016.04.005

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Citations (11)

Stabilisation de la microstructure des couches actives OPV par réticulation

HAL (Le Centre pour la Communication Scientifique Directe) (2013)

Lionel Derue Olivier J. Dautel Aurélien Tournebize Sébastien Berthumeyrie Éric Cloutet

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Photostability of organic materials used in polymer solar cells

Polymer International (2013)

Agnès Rivaton Aurélien Tournebize Julien Gaume Pierre‐Olivier Bussière Jean‐Luc Gardette

To make polymer solar cells (PSCs) a competitive market technology, integrated efforts are required toward the development of highly efficient light harvesting and charge transporting materials with good thermal and photochemical stability, and which can be processed from solution. Nowadays, a critical issue to be solved is enhancing the stability and durability of PSCs. Indeed, the photoactive material used in the active layer dictates the efficiency of the device on the one hand but, on the other hand, it is well known that organic materials are unstable when exposed to light irradiation, which provokes a degradation of their properties. Making long lifetime solar cells with polymers that are susceptible to degradation under light exposure could be an unrealistic challenge. Therefore, elucidating the mechanism of polymer photodegradation is a key point for developing strategies to decrease or prevent the loss of the functional properties of the material. In this paper, the basic concepts of polymer photo-aging are explained first. Then the photodegradation mechanisms of conjugated polymers currently used in PSCs are reported. Finally, as barrier materials able to cut off moisture and oxygen ingress are essential for the stability of PSCs, methods for designing coatings for PSC encapsulation are presented, based on recent publications. © 2013 Society of Chemical Industry

Photodegradation

Degradation

Thermal Stability

Photoactive layer

10.1002/pi.4656

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Citations (99)

Stabilité thermique de la couche active d’une cellule solaire organique par réticulation

HAL (Le Centre pour la Communication Scientifique Directe) (2012)

Lionel Derue Aurel Diacon M. Le Bail Sylvain Chambon J. Du

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Thermal Stabilisation of Polymer–Fullerene Bulk Heterojunction Morphology for Efficient Photovoltaic Solar Cells

Advanced Materials (2014)

Lionel Derue Olivier J. Dautel Aurélien Tournebize Martin Drees Hualong Pan

A novel stable bisazide molecule that can freeze the bulk heterojunction morphology at its optimized layout by specifically bonding to fullerenes is reported. The concept is demonstrated with various polymers: fullerene derivatives systems enable highly thermally stable polymer solar cells.

Morphology

Hybrid solar cell

Thermal Stability

10.1002/adma.201401062

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Citations (154)

Characterization of the degradation process of Si-PCPDTBT:PC70BM(1:2) blend layers deposited on ITO/glass substrate

Solar Energy Materials and Solar Cells (2014)

M. Seck Á. Vincze A. Šatka Daniel Haško F. Uherek

Degradation

Characterization

10.1016/j.solmat.2014.09.014

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Citations (7)