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Inverted organic solar cells comprising a solution-processed cesium fluoride interlayer
10.W. J. H. van Gennip, J. K. J. van Duren, P. C. Thüne, R. A. J. Janssen, and J. W. Niemantsverdriet, J. Chem. Phys. 117, 5031 (2002).
15.L. Zuppiroli, L. Si-Ahmed, K. Kamaras, F. Nüesch, M. N. Bussac, D. Ades, A. Siove, E. Moons, and M. Grätzel, Eur. Phys. J. B 11, 505 (1999).
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We investigate the influence of solution-processed cesium fluoride (CsF) interlayers on the performance of inverted polymersolar cells comprising a blend of poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl -butyric acid methyl ester. The thickness of the CsF layer is optimized in terms of current-voltage characteristics by a variation of the solid content in solution. Capacitance-voltage characteristics reveal a shift of the built-in voltage at the cathode interface by about 0.3 V as compared to devices without a CsF layer, giving rise to an increase in open-circuit voltage by the same value. The vertical distribution of and ions is studied by secondary ion mass spectroscopy, indicating a strong diffusion of the alkaline fluoride into the organic layer stack.
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