Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)

HL 61.16: Poster

Mittwoch, 18. März 2015, 15:00–20:00, Poster F

Influence of electrical stress on the degradation of polymer solar cells — •Tobias Faber, Roland Rösch, and Harald Hoppe — Institute of Physics, Ilmenau University of Technology, Langewiesener Straße 22, 98693 Ilmenau, Germany

The stability of polymer solar cells is an ever-present topic in today’s research on organic photovoltaics. While protocols for stability testing have been established within the course of the International Summits on Organic Solar Cell Stability (ISOS), there is no consensus on the voltage range within which solar cells should be characterized during degradation experiments. We show that this open parameter can result in different effects on the degradation path and the amount of degradation. In-situ measurements of IV-characteristics of continuously illuminated PCDTBT:PC₇₀BM solar cells were conducted every 30 minutes for about 1600 hours. Three different potential regimes were realized by applying three different voltage ranges: ”forward voltage” (-0.1 V ... 5 V), ”basic voltage” (-0.1 V ... 1 V) and ”reverse voltage” (-5 V ... 1 V). A strong influence of the applied voltages and currents running through the device on the initial exponential decrease of the power conversion efficiency, the so-called ”burn-in”, was revealed. The origin of the differences is discussed and degradation pathways are suggested.