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Scanning Kelvin Probe Microscopy on Bulk Heterojunction Polymer Blends
University of Eindhoven, Netherlands.
Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7104-7127
University of Eindhoven, Netherlands.
University of Eindhoven, Netherlands.
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2009 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 19, no 9, 1379-1386 p.Article in journal (Refereed) Published
Abstract [en]

Here, correlated AFM and scanning Kelvin probe microscopy measurements with sub-100 nm resolution on the phase-separated active layer of polymer-fullerene (MDMO-PPV:PCBM) bulk heterojunction solar cells in the dark and under illumination are described. Using numerical modeling a fully quantitative explanation for the contrast and shifts of the surface potential in dark and light is provided. Under illumination an excess of photogenerated electrons is present in both the donor and acceptor phases. From the time evolution of the surface potential after switching off the light the contributions of free and trapped electrons can be identified. Based on these measurements the relative 3D energy level shifts of the sample are calculated. Moreover, by comparing devices with fine and coarse phase separation, it is found that the inferior performance of the latter devices is, at least partially, due to poor electron transport.

Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2009. Vol. 19, no 9, 1379-1386 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-118186DOI: 10.1002/adfm.200801283ISI: 000266285400007OAI: oai:DiVA.org:liu-118186DiVA: diva2:813511
Available from: 2015-05-22 Created: 2015-05-22 Last updated: 2015-06-01

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Kemerink, Martijn
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Chemical and Optical Sensor SystemsThe Institute of Technology
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