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2011
Conference Paper
Titel
Organic photovoltaic solar cells using thin tungsten oxide as interlayer anode contact material
Abstract
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.