Ulrich, S.S.UlrichRösch, R.R.RöschNeubert, T.T.NeubertMushin, B.B.MushinSzyszka, B.B.SzyszkaGobsch, G.G.GobschHoppe, H.H.Hoppe2022-03-112022-03-112011https://publica.fraunhofer.de/handle/publica/37335710.4229/26thEUPVSEC2011-1DV.3.66Recent 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.en667conference paper