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Dynamics of Charge Transfer Excitons Recombination in Polymer/Fullerene Solar Cells

Published online by Cambridge University Press:  14 January 2011

Markus Hallermann ,
Felix Deschler ,
Josef Berger ,
Elizabeth von Hauff  and
Enrico Da Como
Markus Hallermann
Affiliation:
Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-University Munich, Munich 80799, Germany
Felix Deschler
Affiliation:
Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-University Munich, Munich 80799, Germany
Josef Berger
Affiliation:
Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-University Munich, Munich 80799, Germany
Elizabeth von Hauff
Affiliation:
Energy and Semiconductor Research Laboratory, Institute of Physics, Carl von Ossietzky University Oldenburg, Oldenburg 26111, Germany
Enrico Da Como
Affiliation:
Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-University Munich, Munich 80799, Germany
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Abstract

Among the different recombination mechanisms in organic solar cells the photoluminescence (PL) of charge transfer excitons (CTEs) has been identified has one of the most important, impacting both the open circuit voltage and the short circuit current. Here, we study their recombination dynamics, monitoring the decay of the PL on a time scale spanning three orders of magnitude from nanoseconds to microseconds. As a model system we investigate blends of the conjugated polymer poly(2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene-vinylene) (MDMO-PPV) and the fullerene derivative [6,6]-phenyl C61-butyric acid methyl ester (PCBM). We observe that the dynamics of recombination follows a power-law, which is independent of sample morphology. Upon application of a transient electric field, which is capable of separating the bound charge pairs, we observe different dynamics of recombination only for the separated pairs. Those also follow a power-law and show a strong dependence on the film morphology.

Keywords

photovoltaicmorphologyoptoelectronic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1286: Symposium E – Molecular and Hybrid Materials for Electronics and Photonics , 2011 , mrsf10-1286-e02-02
Copyright
Copyright © Materials Research Society 2011

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References

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