Title: Analytical model for the open-circuit voltage and its associated resistance in organic planar heterojunction solar cells
Authors: Cheyns, D ×
Poortmans, Jozef
Heremans, Paul
Deibel, C
Verlaak, S
Rand, B. P
Genoe, Jan #
Issue Date: Apr-2008
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:77 issue:16
Article number: 165332
Abstract: We derive an analytical formula for the open-circuit voltage (V-oc) of organic planar heterojunction solar cells under standard operating conditions. We find that the type of free carrier recombination at the interface between the donor and acceptor materials controls the slope of V-oc vs incident light intensity. By using the same derivation, an equation for the resistance around V-oc is obtained. From this, we investigate two parameters in more detail and compare them to experiments. The first is the work function of the cathode metal. We show that, within our model, V-oc does not depend on this work function, while the cell resistance around V-oc is strongly dependent on it. Second, we find that the asymptotic resistance around V-oc is a third-order power function of the thickness of the organic layers (acceptor or donor). The model provides insights to achieve low-resistivity high open-circuit voltage organic solar cells.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - MICAS, Microelectronics and Sensors
ESAT - ELECTA, Electrical Energy Computer Architectures
Electrical Engineering (ESAT) TC, Technology Campus Diepenbeek
Technologiecluster ESAT Elektrotechnische Engineering
× corresponding author
# (joint) last author

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