Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 46: Organic Photovoltaics I

HL 46.6: Talk

Wednesday, March 16, 2011, 11:30–11:45, FOE Anorg

Luminescence imaging of polymer solar cells: visualization of progressing degradation — Marco Seeland, •Roland Rösch, and Harald Hoppe — Institute of Physics, Ilmenau University of Technology, Ilmenau, Germany

We apply luminescence imaging as tool for the non-destructive visualization of degradation processes within bulk heterojunction polymer solar cells. The imaging technique is based on luminescence detection with a highly sensitive silicon-ccd camera and is able to visualize the with time advancing degradation patterns of polymer solar cells. The devices investigated have been aged under defined conditions and were characterized periodically with current-voltage-sweeps. This allows determining the time evolution of the photovoltaic parameters and - in combination with the luminescence images - understanding differences in the observed degradation behaviour. The versatile usability of the method is demonstrated in a correlation between local reduction of lateral luminescence and a fast decrease of the short-circuit-current due to the loss of active area. Differences in the degradation of photovoltaic parameters under varied aging conditions are discussed.