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Dynamics of Charge Transfer Excitons Recombination inPolymer/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 thephotoluminescence (PL) of charge transfer excitons (CTEs) has beenidentified has one of the most important, impacting both the open circuitvoltage and the short circuit current. Here, we study their recombinationdynamics, monitoring the decay of the PL on a time scale spanning threeorders of magnitude from nanoseconds to microseconds. As a model system weinvestigate blends of the conjugated polymerpoly(2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene-vinylene) (MDMO-PPV)and the fullerene derivative [6,6]-phenyl C61-butyric acid methylester (PCBM). We observe that the dynamics of recombination follows apower-law, which is independent of sample morphology. Upon application of atransient electric field, which is capable of separating the bound chargepairs, we observe different dynamics of recombination only for the separatedpairs. Those also follow a power-law and show a strong dependence on thefilm morphology.

Keywords

photovoltaicmorphologyoptoelectronic

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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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