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dc.contributor.authorLong, Yun
dc.contributor.authorWard, Alexander J.
dc.contributor.authorRuseckas, Arvydas
dc.contributor.authorSamuel, Ifor David William
dc.identifier.citationLong , Y , Ward , A J , Ruseckas , A & Samuel , I D W 2016 , ' Effect of a high boiling point additive on the morphology of solution-processed P3HT-fullerene blends ' , Synthetic Metals , vol. 216 , pp. 23-30 .
dc.identifier.otherPURE: 240125316
dc.identifier.otherPURE UUID: b587d735-158b-4bed-b975-21a1cf6191ec
dc.identifier.otherScopus: 84955607221
dc.identifier.otherORCID: /0000-0001-9114-3522/work/32543056
dc.identifier.otherWOS: 000376809800004
dc.descriptionFunding: UK Engineering and Physical Sciences Research Council (EPSRC) EP/L505079/1, EP/G03673X/1, EP/J009016/1en
dc.description.abstractThe use of high boiling point additives in solution processing has been widely employed to control the active layer morphology in bulk heterojunction organic solar cells. The morphology of the heterojunction is crucial in controlling charge separation and extraction by the electrodes, and therefore the power conversion efficiency (PCE) of the device. This paper presents a study of time-resolved fluorescence quenching in blends of P3HT containing varying concentrations of the fullerenes PC61BM or PC71BM. The relationship between the fluorescence quenching rate and fullerene concentration indicates that the fullerene molecules are dispersed within the P3HT film for up to 5% by mass of fullerene. For higher fullerene concentrations, the additional fullerene molecules aggregate and form fullerene domains. The high degree of phase segregation observed in these blends is beneficial for solar cell performance because the segregated fullerene phase provides electron percolation pathways through the blend. The addition of 1,8-diiodooctane (DIO) to the solutions for spin coating into films changes the scale of fullerene segregation when the ratio by mass of fullerene exceeds 20%. At high fullerene concentrations the rate of fluorescence quenching decreases in P3HT:PC61BM blends when prepared with DIO indicating a larger scale phase separation. The effect of DIO on the morphology of P3HT:PC71BM blends is the opposite in that it causes faster quenching in the blends. Overall the results show that DIO can be used to control the morphology of photovoltaic blends of P3HT with fullerenes.
dc.relation.ispartofSynthetic Metalsen
dc.rights© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en
dc.subjectOrganic solar cellsen
dc.subjectConjugated polymersen
dc.subjectBulk heterojunctionen
dc.subjectFluorescence quenchingen
dc.subjectExciton harvestingen
dc.subjectQD Chemistryen
dc.subjectQC Physicsen
dc.titleEffect of a high boiling point additive on the morphology of solution-processed P3HT-fullerene blendsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.Condensed Matter Physicsen
dc.description.statusPeer revieweden

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