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Effects of air and light exposure on the opto-electronicproperties of polymer:fullerene solar cells

Published online by Cambridge University Press:  02 March 2011

Antonietta De Sio ,
Enrico Da Como ,
Elizabeth von Hauff  and
Jürgen Parisi
Antonietta De Sio
Affiliation:
Energy and Semiconductor Research Laboratory, Institute of Physics, Carl von Ossietzky University of Oldenburg, 26111 Oldenburg, GERMANY
Enrico Da Como
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 of Oldenburg, 26111 Oldenburg, GERMANY
Jürgen Parisi
Affiliation:
Energy and Semiconductor Research Laboratory, Institute of Physics, Carl von Ossietzky University of Oldenburg, 26111 Oldenburg, GERMANY
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Abstract

In this study we investigate how exposure to ambient air and light duringdevice processing affects the opto-electronic properties of poly-3-hexylthiophene (P3HT) : [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) bulkheterojunction solar cells (BHJ). The properties of pure P3HT layersprepared in an inert atmosphere, under ambient conditions, and additionallydegraded under light in ambient conditions were investigated usingphotoluminescence (PL) and photoinduced absorption (PIA). It was observedthat exposure to air during processing leads to oxygen doping of thepolymer. Exposure to air combined with light was found to significantlydecrease the PL and PIA signals. The current-voltage (I-V) and externalquantum efficiency (EQE) characteristics of solar cells fabricated in aninert atmosphere were compared to solar cells processed under ambientconditions. It was observed that processing in air leads to a reduction inthe photocurrent in the devices which is attributed to electron trapping byoxygen in the active layer.

Keywords

polymeroptoelectronicenergy generation

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1286: Symposium E – Molecular and Hybrid Materials for Electronics and Photonics , 2011 , mrsf10-1286-e08-61
Copyright
Copyright © Materials Research Society 2011

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References

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