Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Research in the field of organic solar cells (OSC) is still in an exciting phase, with the number of scientific articles on the topic exponentially increasing over the past decade. However most of the focus so far has been on maximizing the efficiency whereas the equally important aspect of device stability has been given little attention.
In this communication, we investigate theirreversible degradation [1] in inverted organic solar cells based on poly(3-hexylthiophene) (P3HT):phenyl-C61-butyric acid methyl ester (PCBM) bulk heterojucntion active layer via photo-induced carrier extraction by linearly increasing voltage (Photo-CELIV) technique [2].
OSC devices were degraded under AM 1.5 illumination in dry synthetic airand categorized according to percentage loss in optical density. We report a reduction in mobility of charge carriers with increasing degradation obtained from Photo-CELIV studies. Also, the density of equilibrium carriers is found to increase as degradation proceeds. The increase in equilibruim carriers can be attributed to hole doping in the active layer as a result of increase in electron traps [3] whereas decrease in mobility could be attributed to deviations from ideal microstructural morphology with progressive degradation.
Fig (a) Equilibrium carrier density and Fig (b) mobility; as a function of optical density loss.
[1] Andrea Seemann, Tobias Sauermann, Christoph Lungenschmied, Oskar Armbruster, Siegfried Bauerc, H.-J. Egelhaaf, Solar Energy 2011, 85, 1238 [2] A. J. Mozer N. S. Sariciftci, L. Lutsen, D. Vanderzande, R. Österbacka, M. Westerling, G. Juška, Applied Physics Letters 2005, 86, 112104 [3] E. J. Meijer, C. Detcheverry, P. J. Baesjou, E. van Veenendaal, D. M. de Leeuw, T. M. Klapwijk, Journal of Applied Physics 2003, 93, 4831
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