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Study of organic photovoltaics by localized concentrated sunlight: Towards optimization of charge collection in large-area solar cells
4. Y. Galagan, R. Andriessen, E. Rubingh, N. Grossiord, P. Blom, S. Veenstra, W. Verhees, and J. Kroon, in Proceedings of the conference on LOPE-C 2010, Frankfurt, Germany, (OE-A, Frankfurt, Germany, 2010), pp. 88–91.
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Large-area organic solar cells are known to suffer from a major efficiency decrease which originates from the combination of a voltage drop across the front electrode and the voltage-dependent photocurrent. In this letter, we demonstrate this efficiency loss on large area, indiumtin oxide free cells with a hexagonal current collecting front grid, by measurements of light intensity dependence of the cell performance. The results show a major difference in the cell performance measured under localized and uniform illuminations. Subsequently, we demonstrate ways in which the current collecting efficiency could be raised.
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