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Scanning Kelvin probe microscopy on bulk heterojunction polymer blends

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 e...

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Hauptverfasser: Maturová, Klára (VerfasserIn) , Kemerink, Martijn (VerfasserIn) , Wienk, Martinus Maria (VerfasserIn) , Charrier, Dimitri S. H. (VerfasserIn) , Janssen, René A. J. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 08 May 2009
In: Advanced functional materials
Year: 2009, Jahrgang: 19, Heft: 9, Pages: 1379-1386
ISSN:1616-3028
DOI:10.1002/adfm.200801283
Online-Zugang:Verlag, Volltext: https://doi.org/10.1002/adfm.200801283
Verlag, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.200801283
Volltext
Verfasserangaben:by Klára Maturová, Martijn Kemerink, Martijn M. Wienk, Dimitri S.H. Charrier, and René A.J. Janssen

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520 |a 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. 
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