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Optimization of morphologyof P3HT/PCBM films for organic solar cells: effects of thermaltreatments and spin coating solvents*

Published online by Cambridge University Press:  17 January 2007

G. Janssen ,
A. Aguirre ,
E. Goovaerts ,
P. Vanlaeke ,
J. Poortmans  and
J. Manca
G. Janssen
Affiliation:
University of Antwerp, Physics Department-CDE, Universiteitsplein 1, 2610 Antwerp, Belgium
A. Aguirre
Affiliation:
University of Antwerp, Physics Department-CDE, Universiteitsplein 1, 2610 Antwerp, Belgium
E. Goovaerts*
Affiliation:
University of Antwerp, Physics Department-CDE, Universiteitsplein 1, 2610 Antwerp, Belgium
P. Vanlaeke
Affiliation:
IMEC vzw, Kapeldreef 75, 3001 Leuven, Belgium IMEC, Division IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
J. Poortmans
Affiliation:
IMEC vzw, Kapeldreef 75, 3001 Leuven, Belgium
J. Manca
Affiliation:
IMEC, Division IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
*
[email protected]
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Abstract

We demonstrate, by means of light-induced EPR andoptical spectroscopy, that thermal treatment of P3HT/PCBM filmsprepared from CB solution results in a decrease of the chargetransfer yields. The improved performance of solar cells istherefore attributed to optimization of the morphology, inparticular molecular order in the P3HT regions, which could bemonitored by optical absorption and resonant Raman scattering(RRS). We further found that spin coating from slowly evaporatingsolvents leads directly (i.e., without thermal treatment) tooptimal morphologies of the P3HT/PCBM films, with similar resultsfor charge transfer, morphology and solar cell efficiencies.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 37 , Issue 3 , March 2007 , pp. 287 - 290
Copyright
© EDP Sciences, 2007

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Footnotes

*

This paper has been presented at “ECHOS06”, Paris, 28–30 juin 2006.

References

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