Applied Physics Letters · 2012 · 94 citations · 25 references
Natural SciencesChemistryMaterials ScienceElectronic MaterialsMaterials ChemistrySemiconductor MaterialsOrganic Electronic MaterialsOrganic SemiconductorsPhotovoltaic DevicesSemiconductor InterfacesSolar Cell MaterialsSolar CellsCarrier Transport In Organic SemiconductorsElectron Energy LossInterface EnergeticsInverse Photoelectron SpectroscopyOpen-circuit VoltageOrganic Photovoltaic CellsOrganic PhotovoltaicsOrganic Solar Cells
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.
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