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Degradation of electrical properties of small molecule organic solar cells under oxygen and moisture

Published online by Cambridge University Press:  11 June 2014

Laura Ciammaruchi
Affiliation:
CHOSE – Center for Hybrid and Organic Solar Energy, University of Rome Tor Vergata, Italy Chemical Engineering department, University of Rochester, NY, USA
Aldo Di Carlo
Affiliation:
CHOSE – Center for Hybrid and Organic Solar Energy, University of Rome Tor Vergata, Italy
Ching W. Tang
Affiliation:
Chemical Engineering department, University of Rochester, NY, USA
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Abstract

We investigated the photovoltaic (PV) parameters of a planar hetero-junction solar cell with di-[4-(N,Nditolyl-amino)-phenyl] cyclohexane (TAPC) as donor (D) and C60 as acceptor (A), upon exposing the acceptor side to oxygen and moisture. We found that for the same time of exposure, even minor oxygen amounts lead to more detrimental results compared to moisture. We argue that the photo-conversion efficiency (PCE) decreases due to creation of recombination centers at the interface, which induce losses in exciton diffusion and charge generation. Under the same conditions, we also registered a direct connection between the cell PV parameters’ decay and a C60 thin-film conductivity loss.

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Articles
Copyright
Copyright © Materials Research Society 2014 

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References

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