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Effects of Inserting Highly Polar Salts Between the Cathode and Active Layer of Bulk Heterojunction Photovoltaic Devices

Published online by Cambridge University Press:  21 March 2011

Sean E. Shaheen ,
Christoph J. Brabec ,
N. Serdar Sariciftci  and
Ghassan E. Jabbour
Sean E. Shaheen
Affiliation:
Optical Sciences Center, University of Arizona, Tucson, AZ 85721, USA
Christoph J. Brabec
Affiliation:
Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University of Linz, A-4040 Linz, Austria
N. Serdar Sariciftci
Affiliation:
Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University of Linz, A-4040 Linz, Austria
Ghassan E. Jabbour
Affiliation:
Optical Sciences Center, University of Arizona, Tucson, AZ 85721, USA
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Abstract

Thermal deposition of small amounts of various salts at the interface between the active layer and the aluminum cathode was shown to alter the performance of bulk heterojunction photovoltaic devices. LiF and LiBr were found to enhance the power conversion efficiency as compared to devices with no interfacial salt, but Cs and K compounds were found to severely diminish the device performance. It is suggested that the Li compounds preferentially align to produce a bulk dipole moment at the interface, whereas the Cs and K compounds do not.

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References

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