@article{200962ce0d3a4123a781b0a14c394836,
title = "Correlation between interface energetics and open circuit voltage in organic photovoltaic cells",
abstract = "We have used ultraviolet and inverse photoemission spectroscopy to determine the transport gaps (Et) of C60 and diindenoperylene (DIP), and the photovoltaic gap (EPVG) of five prototypical donor/acceptor interfaces used in organic photovoltaic cells (OPVCs). The transport gap of C60 (2.5 ± 0.1) eV and DIP (2.55 ± 0.1) eV at the interface is the same as in pristine films. We find nearly the same energy loss of ca 0.5 eV for all material pairs when comparing the open circuit voltage measured for corresponding OPVCs and EPVG.",
author = "A. Wilke and J. Endres and U. H{\"o}rmann and J. Niederhausen and R. Schlesinger and J. Frisch and P. Amsalem and J. Wagner and M. Gruber and A. Opitz and A. Vollmer and W. Br{\"u}tting and A. Kahn and N. Koch",
note = "Funding Information: The authors thank S. Krause for valuable discussion and S. Olthof and A. Dai for experimental support. We thank A. Elschner (Heraeus Clevios GmbH) for providing PEDT:PSS and J. P. Rabe (HU-Berlin) for granting access to UPS. This work was financially supported by Deutsche Forschungsgemeinschaft (DFG) through SPP1355 and SFB951, the National Science Foundation (NSF) (Grant No. DMR-1005892), and the Princeton MRSEC of the NSF (Grant No. DMR-0819860). U.H. gratefully acknowledges the Bavarian Research Foundation for financial support.",
year = "2012",
month = dec,
day = "3",
doi = "10.1063/1.4769360",
language = "English (US)",
volume = "101",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "23",
}