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  • 1.
    Deribew, Dargie
    et al.
    Université de Bordeaux, France.
    Pavlopoulou, Eleni
    Université de Bordeaux, France.
    Fleury, Guillaume
    Université de Bordeaux, France.
    Nicolet, Célia
    Université de Bordeaux, France.
    Renaud, Cedric
    Université de Bordeaux, France.
    Mougnier, Sébastien-Jun
    Université de Bordeaux, France.
    Vignau, Laurence
    Université de Bordeaux, France.
    Cloutet, Eric
    Université de Bordeaux, France.
    Brochon, Cyril
    Université de Bordeaux, France.
    Cousin, Fabrice
    Laboratoire Léon Brillouin, CEA-CNRS, CEA Saclay, France.
    Portale, Giuseppe
    Netherlands Organization for Scientific Research (NWO), DUBBLE-CRG at the ESRF, Grenoble, France.
    Geoghegan, Mark
    The University of Sheffield, United Kingdom.
    Hadziioannou, Georges
    Université de Bordeaux, France.
    Crystallization-Driven Enhancement in Photovoltaic Performance through Block Copolymer Incorporation into P3HT:PCBM Blends2013Inngår i: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 46, nr 8, s. 3015-3024Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report the increased crystallization of poly(3-hexylthiophene)(P3HT) in the donor−acceptor mixture of [6,6]-phenyl-C61-butyric acid methylester (PCBM) with P3HT by the addition of a block copolymer, P3HT-b-PI, where PI refers to polyisoprene. The photovoltaic performance of devices created using this blendis markedly improved by the addition of the diblock copolymer. We have characterizedthe structure of thin films of the P3HT-b-PI containing mixtures using opticalmicroscopy, scanning force microscopy, UV−vis absorption spectroscopy, neutronreflectometry, and grazing incidence X-ray diffraction (GIXD). The GIXD data providethe information on the crystallinity of the films, the absorption data were used toconfirm that the addition of the diblock was responsible for the increase in crystallization, neutron reflectometry data reveal a PCBM-rich region near the hole injection layer, and the two microscopy techniques revealed the structural effect of the crystallization at the surface of the films.

  • 2.
    Erothu, Harikrishna
    et al.
    Aston University, England.
    Kolomanska, Joanna
    Aston University, England.
    Johnston, Priscilla
    Aston University, England.
    Schumann, Stefan
    Heraeus Deutschland GmbH & Co KG, Germany.
    Deribew, Dargie
    Belect OPV GmbH, Germany.
    Toolan, Daniel T. W.
    University Sheffield, England.
    Gregori, Alberto
    University Pau & Pays Adour, France..
    Dagron-Lartigau, Christine
    University Pau & Pays Adour, France..
    Portale, Giuseppe
    ESRF European Synchrotron, France.
    Bras, Wim
    ESRF European Synchrotron, Netherlands Org Sci Res, DUBBLE ESRF Beamline BM26, F-38043 Grenoble 9, France..
    Arnold, Thomas
    Diamond Light Source Ltd, England.
    Distler, Andreas
    Belect OPV GmbH, Germany.
    Hiorns, Roger C.
    CNRS, France.
    Mokarian-Tabari, Parvaneh
    National University Ireland University Coll Cork, Ireland.
    Collins, Timothy W.
    National University Ireland University Coll Cork, Ireland.
    Howse, Jonathan R.
    University Sheffield, England.
    Topham, Paul D.
    Aston University, England.
    Synthesis, Thermal Processing, and Thin Film Morphology of Poly(3-hexylthiophene)-Poly(styrenesulfonate) Block Copolymers2015Inngår i: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 48, nr 7, s. 2107-2117Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A series of novel block copolymers, processable from single organic solvents and subsequently rendered amphiphilic by thermolysis, have been synthesized using Grignard metathesis (GRIM) and reversible addition-fragmentation chain transfer (RAFT) polymerizations and azide-alkyne click chemistry. This chemistry is simple and allows the fabrication of well-defined block copolymers with controllable block lengths. The block copolymers, designed for use as interfacial adhesive layers in organic photovoltaics to enhance contact between the photoactive and hole transport layers, comprise printable poly(3-hexylthiophene)-block-poly(neopentyl p-styrenesulfonate), P3HT-b-PNSS. Subsequently, they are converted to P3HT-b-poly(p-styrenesulfonate), P3HT-b-PSS, following deposition and thermal treatment at 150 degrees C. Grazing incidence small- and wide-angle X-ray scattering (GISAXS/GIWAXS) revealed that thin films of the amphiphilic block copolymers comprise lamellar nanodomains of P3HT crystallites that can be pushed further apart by increasing the PSS block lengths. The approach of using a thermally modifiable block allows deposition of this copolymer from a single organic solvent and subsequent conversion to an amphiphilic layer by nonchemical means, particularly attractive to large scale roll-to-roll industrial printing processes.

  • 3.
    Pavlopoulou, E.
    et al.
    University Bordeaux, France.
    Fleury, G.
    University Bordeaux, France.
    Deribew, Dargie
    University Bordeaux, France.
    Cousin, F.
    CEA Saclay, France.
    Geoghegan, M.
    University Sheffield, England.
    Hadziioannou, G.
    University Bordeaux, France.
    Phase separation-driven stratification in conventional and inverted P3HT:PCBM organic solar cells2013Inngår i: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 14, nr 5, s. 1249-1254Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We have used neutron reflectivity to investigate the stratification of poly(3-hexylthiophene) (P3HT) and phenyl-C-61-butyric acid methyl ester (PCBM) blend films. Films were spun-cast on poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) and titanium oxide (TiOx) layers to mimic the procedures followed for the fabrication of conventional and inverted organic photovoltaics respectively. The resultant scattering length density profiles reveal a PCBM-rich layer is formed in the vicinity of PEDOT: PSS or TiOx, while PCBM is depleted at the free surface of the film. PCBM segregation close to the substrate is further enhanced by annealing. This stratification is considered to be favorable only for inverted devices. (C) 2013 Elsevier B. V. All rights reserved.

  • 4.
    Renaud, Cedric
    et al.
    University Bordeaux, France.
    Mougnier, Sebastien-Jun
    University Bordeaux, France.
    Pavlopoulou, Eleni
    University Bordeaux, France.
    Brochon, Cyril
    University Bordeaux, France.
    Fleury, Guillaume
    University Bordeaux, France.
    Deribew, Dargie
    University Bordeaux, France.
    Portale, Giuseppe
    University Bordeaux, France.
    Cloutet, Eric
    University Bordeaux, France.
    Chambon, Sylvain
    University Bordeaux, France.
    Vignau, Laurence
    University Bordeaux, France.
    Hadziioannou, Georges
    University Bordeaux, France.
    Block Copolymer as a Nanostructuring Agent for High-Efficiency and Annealing-Free Bulk Heterojunction Organic Solar Cells2012Inngår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 24, nr 16, s. 2196-2201Artikkel i tidsskrift (Fagfellevurdert)
  • 5.
    van Stam, Jan
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013).
    Ericsson, Leif
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).
    Deribew, Dargie
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).
    Moons, Ellen
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).
    Morphology in Dip-Coated Blend Films for Photovoltaics Studied by UV/VIS Absorption and Fluorescence Spectroscopy2018Inngår i: Organic Electronics and Photonics: Fundamentals and Devices / [ed] S. Reineke, K. Vandewal, SPIE-INT SOC OPTICAL ENGINEERING , 2018, artikkel-id UNSP 106870AKonferansepaper (Fagfellevurdert)
    Abstract [en]

    Blend thin films, prepared by dip-coating, of polyfluorene (F8 or PFO), acting as an electron donor, and [6,6]-phenyl-C-61-butyric acid methyl ester (PC60BM), acting as the electron acceptor, have been characterized by UV/VIS absorption spectroscopy, static and dynamic fluorescence, and atomic force microscopy. Four different solvents were used for the film preparation; the monohalogenated fluorobenzene and chlorobenzene and their dihalogenated counterparts o-difluorobenzene and o-dichlorobenzene, respectively. Fluid mechanics calculations were used to determine the withdrawal speed for each solvent, in order to prepare wet films of comparable thicknesses. The resulting dry films were also of similar thicknesses. It was found that the choice of solvent influences the ability for F8 to form its beta-phase.

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