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Phase separation-driven stratification in conventional and inverted P3HT:PCBM organic solar cells
University Bordeaux, France.
University Bordeaux, France.
University Bordeaux, France.
CEA Saclay, France.
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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.

Place, publisher, year, edition, pages
2013. Vol. 14, no 5, p. 1249-1254
Keywords [en]
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: urn:nbn:se:kau:diva-64643DOI: 10.1016/j.orgel.2013.02.020ISI: 000317825800005OAI: oai:DiVA.org:kau-64643DiVA, id: diva2:1148430
Available from: 2017-10-11 Created: 2017-10-11 Last updated: 2017-10-11Bibliographically approved

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Deribew, Dargie
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