Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3387863
Keywords
conducting polymers; II-VI semiconductors; ionisation potential; organic semiconductors; pH; photovoltaic cells; photovoltaic effects; solar cells; work function; zinc compounds
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Funding
- SenterNovem [EOS LT 03026]
- Dutch Polymer Institute (DPI) [660]
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The use of poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) in combination with ZnO as middle electrode in solution-processed organic tandem solar cells requires a pH modification of the PEDOT:PSS dispersion. We demonstrate that this neutralization leads to a reduced work function of PEDOT:PSS, which does not affect the performance of polythiophene:fullerene solar cells, but results in a lower open-circuit voltage of devices based on a polyfluorene derivative with a higher ionization potential. The introduction of a thin layer of a perfluorinated ionomer recovers the anode work function and gives an open-circuit voltage of 1.92 V for a double junction polyfluorene-based solar cell.
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