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High work function transparent middle electrode for organic tandem solar cells

2010; American Institute of Physics; Volume: 96; Issue: 15 Linguagem: Inglês

10.1063/1.3387863

1520-8842

Date Moet, Paul de Bruyn, P. W. M. Blom,

Nanowire Synthesis and Applications

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.