Dresden 2017 – scientific programme
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DS: Fachverband Dünne Schichten
DS 44: Postersession II
DS 44.52: Poster
Thursday, March 23, 2017, 17:00–19:00, P1C
Growth of pinholes in metal electrodes of organic pho- tovoltaic cells — •Daniel Fluhr1, Burhan Muhsin2, Rolf Öttking2, Roland Rösch2, Stefan Krischok1, and Harald Hoppe2 — 1Institute of Physics, Technische Universität Ilmenau, 98693 Ilmenau, Germany — 2Center for Energy and Environmental Chemistry Jena (CEEC Jena) & Laboratory of Organic and Macromolecular Chem- istry (IOMC), Friedrich Schiller University Jena, 07743 Jena, Germany
Lifetime is still a major problem of organic photovoltaic (OPV) cells. There are many reasons for solar cell degradation varying from shunts induced by impurities or electromigration over photoinduced oxidation of active layer materials to corrosion and delamination of the metal contact both induced by oxygen or water ingress. One issue concerns so-called pinholes through the metal back electrode of the device. These pinholes off er pathways for ingress of water and oxygen which may attack the metal-organic interface by introducing delamination through formation of insulating metal oxides or hydrogen evolution. As charge injection and extraction is suppressed at delaminated areas, the active area taking part in power conversion - and hence the overall efficiency becomes reduced. We investigated the infl uence of diff erent environmental conditions on the reduction of the active area of the OPV cell. Spatially resolved measurements give information on location and size of insulated areas induced by pinholes in the metal back contact. Time resolved measurements during degradation of the devices revealed the dynamics and rate of growth of these individual defects.