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Publications (5 of 5) Show all publications
van Stam, J., Ericsson, L., Deribew, D. & Moons, E. (2018). Morphology in Dip-Coated Blend Films for Photovoltaics Studied by UV/VIS Absorption and Fluorescence Spectroscopy. In: S. Reineke, K. Vandewal (Ed.), Organic Electronics and Photonics: Fundamentals and Devices. Paper presented at Conference on Organic Electronics and Photonics - Fundamentals and Devices, APR 24-26, 2018, Strasbourg, FRANCE. SPIE-INT SOC OPTICAL ENGINEERING, Article ID UNSP 106870A.
Open this publication in new window or tab >>Morphology in Dip-Coated Blend Films for Photovoltaics Studied by UV/VIS Absorption and Fluorescence Spectroscopy
2018 (English)In: Organic Electronics and Photonics: Fundamentals and Devices / [ed] S. Reineke, K. Vandewal, SPIE-INT SOC OPTICAL ENGINEERING , 2018, article id UNSP 106870AConference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
SPIE-INT SOC OPTICAL ENGINEERING, 2018
Series
Proceedings of SPIE, ISSN 0277-786X ; 10687
National Category
Physical Sciences Materials Engineering Chemical Sciences
Research subject
Physics; Chemistry
Identifiers
urn:nbn:se:kau:diva-70966 (URN)10.1117/12.2306857 (DOI)000453618300001 ()978-1-5106-1901-2 (ISBN)
Conference
Conference on Organic Electronics and Photonics - Fundamentals and Devices, APR 24-26, 2018, Strasbourg, FRANCE
Available from: 2019-02-07 Created: 2019-02-07 Last updated: 2019-06-14Bibliographically approved
Erothu, H., Kolomanska, J., Johnston, P., Schumann, S., Deribew, D., Toolan, D. T. W., . . . Topham, P. D. (2015). Synthesis, Thermal Processing, and Thin Film Morphology of Poly(3-hexylthiophene)-Poly(styrenesulfonate) Block Copolymers. Macromolecules, 48(7), 2107-2117
Open this publication in new window or tab >>Synthesis, Thermal Processing, and Thin Film Morphology of Poly(3-hexylthiophene)-Poly(styrenesulfonate) Block Copolymers
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2015 (English)In: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 48, no 7, p. 2107-2117Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2015
National Category
Materials Engineering
Research subject
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-64642 (URN)10.1021/acs.macromol.5b00213 (DOI)000353176900022 ()
Available from: 2017-10-11 Created: 2017-10-11 Last updated: 2019-06-10Bibliographically approved
Deribew, D., Pavlopoulou, E., Fleury, G., Nicolet, C., Renaud, C., Mougnier, S.-J., . . . Hadziioannou, G. (2013). Crystallization-Driven Enhancement in Photovoltaic Performance through Block Copolymer Incorporation into P3HT:PCBM Blends. Macromolecules, 46(8), 3015-3024
Open this publication in new window or tab >>Crystallization-Driven Enhancement in Photovoltaic Performance through Block Copolymer Incorporation into P3HT:PCBM Blends
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2013 (English)In: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 46, no 8, p. 3015-3024Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2013
National Category
Natural Sciences
Research subject
Energy Technology
Identifiers
urn:nbn:se:kau:diva-64605 (URN)10.1021/ma302128h (DOI)000318143500014 ()
Available from: 2017-10-05 Created: 2017-10-05 Last updated: 2019-06-10Bibliographically approved
Pavlopoulou, E., Fleury, G., Deribew, D., Cousin, F., Geoghegan, M. & Hadziioannou, G. (2013). Phase separation-driven stratification in conventional and inverted P3HT:PCBM organic solar cells. Organic electronics, 14(5), 1249-1254
Open this publication in new window or tab >>Phase separation-driven stratification in conventional and inverted P3HT:PCBM organic solar cells
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2013 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 14, no 5, p. 1249-1254Article in journal (Refereed) Published
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.

Keywords
Organic photovoltaics, Active layer morphology, Vertical phase separation, Neutron reflectivity
National Category
Textile, Rubber and Polymeric Materials Manufacturing, Surface and Joining Technology
Research subject
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-64643 (URN)10.1016/j.orgel.2013.02.020 (DOI)000317825800005 ()
Available from: 2017-10-11 Created: 2017-10-11 Last updated: 2019-06-10Bibliographically approved
Renaud, C., Mougnier, S.-J., Pavlopoulou, E., Brochon, C., Fleury, G., Deribew, D., . . . Hadziioannou, G. (2012). Block Copolymer as a Nanostructuring Agent for High-Efficiency and Annealing-Free Bulk Heterojunction Organic Solar Cells. Advanced Materials, 24(16), 2196-2201
Open this publication in new window or tab >>Block Copolymer as a Nanostructuring Agent for High-Efficiency and Annealing-Free Bulk Heterojunction Organic Solar Cells
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2012 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 24, no 16, p. 2196-2201Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2012
Keywords
block copolymers, bulk heterojunction solar cells, nanostucturing agents, annealing-free process
National Category
Materials Engineering Textile, Rubber and Polymeric Materials
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-64645 (URN)10.1002/adma.201104461 (DOI)000302904800018 ()22447735 (PubMedID)
Available from: 2017-10-11 Created: 2017-10-11 Last updated: 2019-06-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2589-4667

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