Re-evaluating the role of sterics and electronic coupling in determining the open-circuit voltage of organic solar cells
Ngongang Ndjawa, Guy Olivier
Hoke, Eric T.
Thompson, Mark E.
McGehee, Michael D.
KAUST DepartmentMaterials Science and Engineering Program
Physical Sciences and Engineering (PSE) Division
KAUST Solar Center (KSC)
Organic Electronics and Photovoltaics Group
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AbstractThe effects of sterics and molecular orientation on the open-circuit voltage and absorbance properties of charge-transfer states are explored in model bilayer organic photovoltaics. It is shown that the open-circuit voltage correlates linearly with the charge-transfer state energy and is not significantly influenced by electronic coupling. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
SponsorsThis publication was supported by the Center for Advanced Molecular Photovoltaics (Award No KUS-C1-015-21) and was made possible by King Abdullah University of Science and Technology (KAUST). Portions of this research were carried out at the Stanford Synchrotron Radiation Lightsource, a Directorate of SLAC National Accelerator Laboratory and an Office of Science User Facility operated for the US Department of Energy Office of Science by Stanford University. We also acknowledge Michael F. Toney for assistance with GIWAXS measurements at beamline 11-3. K.R.G. and A.A. acknowledge SABIC for a post-doctoral fellowship. G.O.N.N., K.R.G., M.D.M., and A.A. acknowledge the Office of Competitive Research Funds for a GRP-CF award. This work was partially supported by the Department of Energy, Laboratory Directed Research and Development funding, under contract DE-AC02-76SF00515 (K.V.).
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