Journal
JOURNAL OF APPLIED PHYSICS
Volume 92, Issue 8, Pages 4266-4270Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1506385
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The influence of device structure on the open-circuit voltage of polyfluorene-based photovoltaic devices has been investigated. Bilayers of hole- and electron-accepting polyfluorenes have been fabricated using an aqueous float-off lamination technique and subsequently incorporated into organic photovoltaic devices with a range of cathodes and anodes. A scaling of the open-circuit voltage with electrode work function difference has been observed with an additional intensity- dependent contribution from the active layer within the device. This additional contribution is attributed to photoinduced generation of carriers, whereby accumulation of charge at the polymer-polymer heterojunction results in a dipole across the interface and gives rise to a diffusion current that must be counterbalanced by a drift current at open circuit. (C) 2002 American Institute of Physics.
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