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The modulation of bulk-organic solar cells: the effect of serial and parallel resistances and the relationship with the microscopic morphology

Published online by Cambridge University Press:  07 July 2011

A.J. Trindade ,
M.G. Santos ,
J. Gomes  and
L. Pereira
A.J. Trindade
Affiliation:
Department of Physics and i3N – Institute of Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro, 3810-193, Aveiro, Portugal.
M.G. Santos
Affiliation:
Department of Physics and i3N – Institute of Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro, 3810-193, Aveiro, Portugal.
J. Gomes
Affiliation:
CeNTI – Centre for Nanotechnology and Smart Materials, Rua Fernando Mesquita, 2785, Apart. 293, 4760-034 Vila Nova de Famalicão, Portugal.
L. Pereira
Affiliation:
CeNTI – Centre for Nanotechnology and Smart Materials, Rua Fernando Mesquita, 2785, Apart. 293, 4760-034 Vila Nova de Famalicão, Portugal.
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Abstract

This work shows the relationship between the morphology (studied by AFM) of an active bulk-heterojunction (BHJ) layer composed by MEH-PPV (poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene) and PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) and the respective photovoltaic figures of merit. It is observed that the most relevant parameter (influencing the efficiency) is the fill-factor (FF), as both the open circuit voltage and short circuit current are not significantly affected by the microscopic morphology. Different local conformation of the active films can change the FF from near 25% to more than 65%, having a strong impact in the efficiency. These results were modulated by an equivalent circuit. Serial and parallel resistances were related with the physical behavior of the organic cells. These were observed to have a direct relationship with the achieved morphology.

Keywords

organicphotovoltaicelectrical properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1359: Symposium NN – Electronic Organic and Inorganic Hybrid Nanomaterials—Synthesis, Device Physics and Their Applications , 2011 , mrss11-1359-nn06-19
Copyright
Copyright © Materials Research Society 2011

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References

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