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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations

CPP 50.18: Poster

Mittwoch, 22. März 2017, 18:30–21:00, P3

Degradation in polymer-fullerene bulk heterojunction solar cells due to charge carrier recombination — •Eliuter Nderimo, Arne Müller, and Veit Wagner — Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany

Organic solar cells have become an increasingly important form of solar cells in recent years. The prolonged illumination of solar cells under sunlight usually leads to a slow reduction of their efficiency. Studying their degradation allows us to accurately predict their power delivery over time. In this work we will focus on the recombination dynamics of PTB7:PCBM bulk-hetero junction solar cells under prolonged illumination. We show that the change in efficiency of the solar cells over time due to charge carrier recombination is a dominating factor of degradation. This is done by applying different potential biases to the cell under continuous AM1.5G equivalent illumination. The lifetime of the solar cell is decreased by a factor of 10 if the charges recombine in the semiconductor bulk (Voc condition) instead of being extracted (Jsc condition). Other means of degradation, such as oxygen and water vapour interference, were minimized by encapsulation. From dark measurements the pure degradation by recombination is extracted and supports the observed effect under illumination.