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Organic photovoltaic solar cells using thin tungsten oxide as interlayer anode contact material

: Ulrich, S.; Rösch, R.; Neubert, T.; Mushin, B.; Szyszka, B.; Gobsch, G.; Hoppe, H.


European Commission:
26th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC. Proceedings : 5th to 9th September 2011 at the CCH - Congress Centre and International Fair Hamburg in Germany
München: WIP-Renewable Energies, 2011
ISBN: 3-936338-27-2
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <26, 2011, Hamburg>
Fraunhofer IST ()

Recent results for single junction bulk heterojunction OPV devices show markedly improved efficiencies above 8 %. However, long term stability remains an open issue. The common ITO anode contact in combination with PEDOT:PSS is known as a severe source of degradation. We investigate P3HT:PCBM based organic solar cells using an alternative PEDOT:PSS free anode contact structure using a thin WO3 interlayer for hole extraction: Glass / ITO / WO3 (0 - 20 nm) / P3HT:PCBM/Al. We report on parameter variation of the device preparation with respect to WO3 interlayer thickness. RF sputter deposition from ceramic ITO and reactive DC sputter deposition from metallic W targets was used for deposition of the Glass / ITO / WO structure. By comparison of the solar cell performance with the conventional device structure, the proof-of-principle and applicability of these potentially long-term stable oxide interlayer contact as PEDOT:PSS replacements is demonstrated. The dependence of solar cell parameters on the oxide layer thickness is analyzed.