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Dzwilewski, Andrzej
Publications (10 of 15) Show all publications
Anselmo, A. S., Dzwilewski, A., Svensson, K. & Moons, E. (2016). Photodegradation of the electronic structure of PCBM and C60 films in air. Chemical Physics Letters, 652, 220-224
Open this publication in new window or tab >>Photodegradation of the electronic structure of PCBM and C60 films in air
2016 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 652, p. 220-224Article in journal (Refereed) Published
Abstract [en]

Fullerenes are common electron acceptors in organic solar cells. Here the photostability in air of the electronic structures of spin-coated PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) and evaporated C60 films are studied using ultraviolet photoelectron spectroscopy (UPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. After exposing these materials in air to simulated sunlight, the filled and empty molecular orbitals are strongly altered, indicating that the conjugated π-system of the C60-cage has degraded. Even a few minutes in normal lab light induces changes. These results stress the importance of protecting fullerene-based films from light and air during processing, operation, and storage.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Degradation; Fullerene; Photostability; Photovoltaics; NEXAFS
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-16111 (URN)10.1016/j.cplett.2016.04.003 (DOI)000377204100042 ()
Note

The article was still in manuscript form in anna Anselmos thesis. It had then the title: Light-induced modification of the electronic structure of PCBM and C60 films

Available from: 2012-12-07 Created: 2012-12-07 Last updated: 2019-05-20Bibliographically approved
Talyzin, A. V., Luzan, S., Anoshkin, I. V., Nasibulin, A. G., Kauppinnen, E. I., Dzwilewski, A., . . . Grennberg, H. (2014). Hydrogen-Driven Cage Unzipping of C-60 into Nano-Graphenes. The Journal of Physical Chemistry C, 118(12), 6504-6513
Open this publication in new window or tab >>Hydrogen-Driven Cage Unzipping of C-60 into Nano-Graphenes
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2014 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, no 12, p. 6504-6513Article in journal (Refereed) Published
Abstract [en]

Annealing of C-60 in hydrogen at temperatures above the stability limit of C H bonds in C60Hx (500-550 degrees C) is found to result in direct collapse of the cage structure, evaporation of light hydrocarbons, and formation of solid mixture composed of larger hydrocarbons and few-layered graphene sheets. Only a minor part of this mixture is soluble; this was analyzed using matrix-assisted laser desorption/ionization MS, Fourier transform infrared (FTIR), and nuclear magnetic resonance spectroscopy and found to be a rather complex mixture of hydrocarbon molecules composed of at least tens of different compounds. The sequence of most abundant peaks observed in MS, which corresponds to C2H2 mass difference, suggests a stepwise breakup of the fullerene cage into progressively smaller molecular fragments edge-terminated by hydrogen. A simple model of hydrogen-driven C-60 unzipping is proposed to explain the observed sequence of fragmentation products. The insoluble part of the product mixture consists of large planar polycyclic aromatic hydrocarbons, as evidenced by FTIR and Raman spectroscopy, and some larger sheets composed of few-layered graphene, as observed by transmission electron microscopy. Hydrogen annealing of C-60 thin films showed a thickness-dependent results with reaction products significantly different for the thinnest films compared to bulk powders. Hydrogen annealing of C-60 films with the thickness below 10 nm was found to result in formation of nanosized islands with Raman spectra very similar to the spectra of coronene oligomers and conductivity typical for graphene.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014
National Category
Physical Sciences
Identifiers
urn:nbn:se:kau:diva-41543 (URN)10.1021/jp500377s (DOI)000333578300059 ()
Available from: 2016-04-25 Created: 2016-04-11 Last updated: 2019-05-20Bibliographically approved
Anselmo, A. S., Dzwilewski, A., Svensson, K. & Moons, E. (2013). Molecular Orientation and Composition at the Surface of Spin-Coated Polyfluorene:Fullerene Blend Films. Journal of Polymer Science Part B: Polymer Physics, 51(3), 176-182
Open this publication in new window or tab >>Molecular Orientation and Composition at the Surface of Spin-Coated Polyfluorene:Fullerene Blend Films
2013 (English)In: Journal of Polymer Science Part B: Polymer Physics, ISSN 0887-6266, E-ISSN 1099-0488, Vol. 51, no 3, p. 176-182Article in journal (Refereed) Published
Abstract [en]

The surface composition in spin-coated films of polyfluorene:fullerene blends was determined quantitatively by near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. By comparing partial and total electron yield spectra, we found vertical compositional differences in the surface region. Furthermore, the orientation of the polymer chains was investigated by variable-angle NEXAFS. Blend films of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole] with [6,6]-phenyl-C61-butyric acid methyl ester in two different blend ratios were studied. Results showed polymer enrichment of the surfaces for films with a polymer:fullerene weight ratio of 20:80 and of 50:50, spin-coated from both chlorobenzene and chloroform solutions. The angular dependence of the NEXAFS spectra of the pure polymer films showed a preferential plane-on orientation, which was slightly stronger in the subsurface region than at the surface. In blend films, this orientational preference was less pronounced and the difference between surface and subsurface vanished

Place, publisher, year, edition, pages
Hoboken, New Jersey: John Wiley & Sons, 2013
Keywords
polymer solar cell, bulk heterojunction, phase separation, morphology, miscibility, near-edge X-ray absorption fine structure
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-16005 (URN)10.1002/polb.23198 (DOI)000312728600002 ()
Available from: 2012-11-30 Created: 2012-11-30 Last updated: 2019-05-20Bibliographically approved
Brumboiu, I., Anselmo, A. S., Brena, B., Dzwilewski, A., Svensson, K. & Moons, E. (2013). Near-edge X-ray Absorption Fine Structure Study of the C60-derivative PCBM. Chemical Physics Letters, 568-569, 130-134
Open this publication in new window or tab >>Near-edge X-ray Absorption Fine Structure Study of the C60-derivative PCBM
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2013 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 568-569, p. 130-134Article in journal (Refereed) Published
Abstract [en]

The fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester plays a key role for electron transport in polymer solar cells. We have studied the unoccupied molecular orbitals of PCBM by near edge X-ray absorption fine structure spectroscopy and were able to assign the main resonances to molecular moieties by comparison with calculated sum spectra of individual carbons. We analyzed specifically the origin of the high-energy shoulder to the first π-resonance and identified contributions from the lowest-energy transition of a specific carbon in the phenyl and from transitions to higher unoccupied orbitals of the unmodified carbons in the C60-cage.

Place, publisher, year, edition, pages
Amsterdam: , 2013
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-16110 (URN)10.1016/j.cplett.2013.03.031 (DOI)000318320300025 ()
Note

(included in PhD thesis: Material aspects in spin-coated films for polymer photovoltaics, Ana Sofia Anselmo)

Available from: 2012-12-07 Created: 2012-12-07 Last updated: 2019-05-20Bibliographically approved
Dzwilewski, A., Anselmo, A. S., Svensson, K. & Moons, E. (2012). Light induced effects in PCBM:P3HT blend films. In: Anders Hagfeldt (Ed.), Hybrid and Organics Photovoltaics Conference: Uppsala, Sweden, 2012. Paper presented at 4th international Conference on Hybrid and Organic Photovoltaics, HOPV12, Uppsala, 6-9 May 2012 (pp. 155-155). SEFIN, Castelló (Spain)
Open this publication in new window or tab >>Light induced effects in PCBM:P3HT blend films
2012 (English)In: Hybrid and Organics Photovoltaics Conference: Uppsala, Sweden, 2012 / [ed] Anders Hagfeldt, SEFIN, Castelló (Spain), 2012, p. 155-155Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
SEFIN, Castelló (Spain): , 2012
Series
Nanoenergy Series ; Vol. 9
Keywords
fullerene, photovoltaics, molecular, photostability
National Category
Condensed Matter Physics Materials Chemistry
Research subject
Materials Science; Physics; Chemistry
Identifiers
urn:nbn:se:kau:diva-29029 (URN)978-84-940189-0-9 (ISBN)
Conference
4th international Conference on Hybrid and Organic Photovoltaics, HOPV12, Uppsala, 6-9 May 2012
Funder
Swedish Research Council, 2010-4155
Available from: 2013-09-13 Created: 2013-09-13 Last updated: 2019-05-20Bibliographically approved
Anselmo, A. S., Dzwilewski, A., Wang, E., Andersson, M. R., van Stam, J., Svensson, K. & Moons, E. (2012). Molecular orientation and composition at the surface of APFO3:PCBM blend films. In: Anders Hagfeldt (Ed.), Hybrid and Organics Photovoltaics Conference: Uppsala, Sweden, 2012. Paper presented at 4th international Conference on Hybrid and Organic Photovoltaics, HOPV12, Uppsala, 6-9 May 2012 (pp. 278). SEFIN, Castelló (Spain)
Open this publication in new window or tab >>Molecular orientation and composition at the surface of APFO3:PCBM blend films
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2012 (English)In: Hybrid and Organics Photovoltaics Conference: Uppsala, Sweden, 2012 / [ed] Anders Hagfeldt, SEFIN, Castelló (Spain), 2012, p. 278-Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
SEFIN, Castelló (Spain): , 2012
Series
Nanoenergy Series ; Vol. 9
Keywords
polymer, solar cell, photovoltaics
National Category
Materials Chemistry Condensed Matter Physics
Research subject
Materials Science; Physics; Chemistry
Identifiers
urn:nbn:se:kau:diva-29032 (URN)978-84-940189-0-9 (ISBN)
Conference
4th international Conference on Hybrid and Organic Photovoltaics, HOPV12, Uppsala, 6-9 May 2012
Funder
Swedish Research Council, 2010-4155
Available from: 2013-09-13 Created: 2013-09-13 Last updated: 2019-05-20Bibliographically approved
Anselmo, A. S., Dzwilewski, A., Rysz, J., Budkowski, A., Svensson, K., van Stam, J. & Moons, E. (2012). Polymer solar cells: Visualizing vertical phase separation in solution-processed films of polymer fullerene blends. In: Hans-Klaus Roth, Klaus Heinemann (Ed.), Proceedings of the 5th International Symposium Technologies for Polymer Electronics - TPE 12: . Paper presented at 5th International Symposium Technologies for Polymer Electronics - TPE 12 - May 24-26, 2012, Rudolstadt, Germany (pp. 125-128). Ilmenau, Germany: Universitätsverlag Ilmenau
Open this publication in new window or tab >>Polymer solar cells: Visualizing vertical phase separation in solution-processed films of polymer fullerene blends
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2012 (English)In: Proceedings of the 5th International Symposium Technologies for Polymer Electronics - TPE 12 / [ed] Hans-Klaus Roth, Klaus Heinemann, Ilmenau, Germany: Universitätsverlag Ilmenau , 2012, p. 125-128Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Ilmenau, Germany: Universitätsverlag Ilmenau, 2012
National Category
Condensed Matter Physics Textile, Rubber and Polymeric Materials
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-15767 (URN)978-3-86360-022-8 (ISBN)
Conference
5th International Symposium Technologies for Polymer Electronics - TPE 12 - May 24-26, 2012, Rudolstadt, Germany
Available from: 2012-11-23 Created: 2012-11-23 Last updated: 2019-05-20Bibliographically approved
Moons, E., Anselmo, A. S., Dzwilewski, A., Svensson, K. & van Stam, J. (2012). Vertical Phase Separation in Polymer:Fullerene Films for Photovoltaics. In: Anders Hagfeldt (Ed.), Hybrid and Organics Photovoltaics Conference 2012: Uppsala, Sweden, 6th to 9th May 2012. Paper presented at 4th international Conference on Hybrid and Organic Photovoltaics, HOPV12 (pp. 53-53). Castelló, Spain: Society for Nanomolecular Photovoltaics (SEFIN)
Open this publication in new window or tab >>Vertical Phase Separation in Polymer:Fullerene Films for Photovoltaics
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2012 (English)In: Hybrid and Organics Photovoltaics Conference 2012: Uppsala, Sweden, 6th to 9th May 2012 / [ed] Anders Hagfeldt, Castelló, Spain: Society for Nanomolecular Photovoltaics (SEFIN) , 2012, p. 53-53Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Castelló, Spain: Society for Nanomolecular Photovoltaics (SEFIN), 2012
Series
Nanoenergy Symposia ; 9
Keywords
energy, nano, photovoltaics, molecular
National Category
Materials Chemistry Physical Chemistry Condensed Matter Physics
Research subject
Materials Science; Physics; Chemistry
Identifiers
urn:nbn:se:kau:diva-29024 (URN)978-84-940189-0-9 (ISBN)
Conference
4th international Conference on Hybrid and Organic Photovoltaics, HOPV12
Funder
Swedish Research Council, 2010-4155
Available from: 2013-09-13 Created: 2013-09-13 Last updated: 2019-05-20Bibliographically approved
Anselmo, A. S., Dzwilewski, A., Rysz, J., Bernasik, A., Budkowski, A., Andersson, M. R., . . . Moons, E. (2011). Characterisation of vertical phase separation in polymer: fullerene blend films for photovoltaics by dSIMS and NEXAFS. In: E-MRS 2011 Spring Meeting: Bilateral Energy Conference. Paper presented at E-MRS 2011 Spring Meeting, Bilateral Energy Conference, Acropolis Congress Center, Nice, France, May 9-13, 2011 (pp. 62-63). Malden, MA: John Wiley & Sons
Open this publication in new window or tab >>Characterisation of vertical phase separation in polymer: fullerene blend films for photovoltaics by dSIMS and NEXAFS
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2011 (English)In: E-MRS 2011 Spring Meeting: Bilateral Energy Conference, Malden, MA: John Wiley & Sons, 2011, p. 62-63Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Morphological control and characterization of blend films is key in the development of viable polymer solar cells. Spontaneous formation of vertical compositional gradients during solution processing has been shown for polyfluorene:PCBM blends and rationalized with thermodynamic and kinetic models of nucleation and spinodal decomposition.[1, 2] The extent of vertical stratification is affected by polymer side-chain modification aimed at controlling polymer:fullerene miscibility.[3] Here we present high-resolution film morphology results for several polymer:fullerene systems as obtained from near-edge X-ray fine structure spectroscopy (NEXAFS) in partial and in total electron yield modes. Blend films were found to be polymer- enriched at the surface. Dynamic secondary ion mass spectrometry (dSIMS) and NEXAFS give compositional information at different depths, resulting in a more complete picture of the film morphology.

 

Place, publisher, year, edition, pages
Malden, MA: John Wiley & Sons, 2011
National Category
Condensed Matter Physics
Research subject
Physics; Materials Science
Identifiers
urn:nbn:se:kau:diva-15768 (URN)
Conference
E-MRS 2011 Spring Meeting, Bilateral Energy Conference, Acropolis Congress Center, Nice, France, May 9-13, 2011
Funder
Swedish Research Council, 2010-4155
Available from: 2012-11-23 Created: 2012-11-23 Last updated: 2019-05-20Bibliographically approved
Talyzin, A., Luzan, S., Leifer, K., Akhtar, S., Fetzer, J., Cataldo, F., . . . Moons, E. (2011). Coronene fusion by heat treatment: Road to nanographenes. The Journal of Physical Chemistry C, 115(27), 13207-13214
Open this publication in new window or tab >>Coronene fusion by heat treatment: Road to nanographenes
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2011 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, no 27, p. 13207-13214Article in journal (Refereed) Published
Abstract [en]

The reactions of coronene dehydrogenation and fusion upon heat treatment in the temperature range of 500700 C were studied using XRD, TEM, Raman, IR, and NEXAFS spectroscopy. The formation of a coronene dimer (dicoronylene) was observed at temperatures 530-550 C; dicoronylene can easily be separated using sublimation with a temperature gradient. An insoluble and not sublimable black precipitate was found to form at higher temperatures. Analysis of the data shows that dimerization of coronene is followed at 550600 C by oligomerization into larger molecules. Above 600 C amorphization of the material and formation of graphitic nanoparticles was observed. Coronene fusion by annealing is proposed as a road to synthesis of larger polycyclic aromatic hydrocarbons and nanographenes.

Place, publisher, year, edition, pages
Washington: American Chemical Society, 2011
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-15736 (URN)10.1021/jp2028627 (DOI)000292479700011 ()
Available from: 2012-11-22 Created: 2012-11-22 Last updated: 2019-05-20Bibliographically approved
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