Dresden 2009 – scientific programme
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.63: Poster
Thursday, March 26, 2009, 16:30–19:00, P1A
Degradation studies on organic pin solar cells containing ZnPc and C60 — •Martin Hermenau, Moritz Riede, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
In addition to the power conversion efficiency of organic solar cells, the lifetime of these devices plays an important role for the market entry as commercial products. Therefore a detailed understanding of degradation of organic solar cells is necessary. In this work, we present ageing studies of small-molecule solar cells with a pin structure and a mixed heterojunction of Zinc-Phthalocyanine and fullerene C60. These devices have an initial efficiency of 2.8% under solar irradiation.
The ageing dynamics of these solar cells are observed under different conditions, e.g. illumination and temperature, and compared to reference devices which are stored in the dark. The external quantum efficiency of these cells is measured before and after ageing studies to observe changes in different spectral ranges. The relative change of external quantum efficiency does not depend on the colour of the incident light during time of ageing, indicating the stability of the absorbing layers during the observed time span.