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Molecular orientation and composition at the surface of APFO3:PCBM blend films
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för fysik och elektroteknik. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. (Materialfysik)
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för fysik och elektroteknik. (Materialvetenskap)
Chalmers University of Technology. (Department of Chemical and Biological Engineering)
Chalmers University of Technology. (Department of Chemical and Biological Engineering)
Visa övriga samt affilieringar
2012 (Engelska)Ingår i: Hybrid and Organics Photovoltaics Conference: Uppsala, Sweden, 2012 / [ed] Anders Hagfeldt, SEFIN, Castelló (Spain), 2012, s. 278-Konferensbidrag, Poster (med eller utan abstract) (Refereegranskat)
Ort, förlag, år, upplaga, sidor
SEFIN, Castelló (Spain), 2012. s. 278-
Serie
Nanoenergy Series ; Vol. 9
Nyckelord [en]
polymer, solar cell, photovoltaics
Nationell ämneskategori
Materialkemi Den kondenserade materiens fysik
Forskningsämne
Materialvetenskap; Fysik; Kemi
Identifikatorer
URN: urn:nbn:se:kau:diva-29032ISBN: 978-84-940189-0-9 (tryckt)OAI: oai:DiVA.org:kau-29032DiVA, id: diva2:647985
Konferens
4th international Conference on Hybrid and Organic Photovoltaics, HOPV12, Uppsala, 6-9 May 2012
Forskningsfinansiär
Vetenskapsrådet, 2010-4155Tillgänglig från: 2013-09-13 Skapad: 2013-09-13 Senast uppdaterad: 2019-05-20Bibliografiskt granskad
Ingår i avhandling
1. The morphology of polyfluorene: fullerene blend films for photovoltaic applications
Öppna denna publikation i ny flik eller fönster >>The morphology of polyfluorene: fullerene blend films for photovoltaic applications
2011 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Polymer photovoltaic systems whose photoactive layer is a blend of a semiconducting polymer with a fullerene derivative in a bulk heterojunction configuration are amongst the most successful organic photovoltaic devices nowadays. The three-dimensional organization in these layers (the morphology) plays a crucial role in the performance of the devices. Detailed characterization of this organization at the nanoscale would provide valuable information for improving future material and architectural design and for device optimization.

In this thesis, the results of morphology studies of blends of several polyfluorene copolymers (APFOs) blended with a fullerene derivative are presented. Near-Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy was combined with dynamic Secondary Ion Mass Spectrometry (dSIMS) for surface and in-depth characterization of the blend films. NEXAFS was performed using two different electron detection methods, partial (PEY) and total (TEY) electron yield, which provide information from different depth regimes. Quantitative compositional information was obtained by fitting the spectra of the blend films with a linear combination of the spectra of films of the pure components. In blends of APFO3 with PCBM in two different blend ratios (1:1 and 1:4 of polymer:fullerene) NEXAFS data show the existence of compositional gradients in the vertical direction for both blend ratios, with clear polymer enrichment of the free surface. A series of APFOs with systematic changes in the side-chains was studied and it was shown that those small modifications can affect polymer:fullerene interaction and induce vertical phase separation. Polymer-enrichment of the free surface was clearly identified, in accordance with surface energy minimization mechanisms, and a compositional gradient was revealed already in the first few nanometers of the surface of the blend films. dSIMS showed that this vertical phase separation propagates throughout the film. It was possible to determine that as the polar character of the polymer increases, and thus the polymer:fullerene miscibility is improved, the tendency for vertical phase separation becomes stronger.

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstad University, 2011. s. 47
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2011:36
Nyckelord
Materials Science, Organic Photovoltaics, Polymer Solar Cells
Nationell ämneskategori
Materialteknik
Forskningsämne
Materialteknik
Identifikatorer
urn:nbn:se:kau:diva-7950 (URN)978-91-7063-370-6 (ISBN)
Presentation
2011-09-02, 21D 302, Karlstads universitet, Karlstad, 10:15 (Svenska)
Opponent
Anmärkning

Paper II was not published at the time of the licentiate defence and had the title: NEXAFS spectroscopy study of the surface composition in APFO3:PCBM blend films

Tillgänglig från: 2011-08-10 Skapad: 2011-07-11 Senast uppdaterad: 2016-08-16Bibliografiskt granskad

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Anselmo, Ana SofiaDzwilewski, Andrzejvan Stam, JanSvensson, KristerMoons, Ellen

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Anselmo, Ana SofiaDzwilewski, Andrzejvan Stam, JanSvensson, KristerMoons, Ellen
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Avdelningen för fysik och elektroteknikMaterialvetenskapAvdelningen för kemi och biomedicinsk vetenskap
MaterialkemiDen kondenserade materiens fysik

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