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Organic solar cells with a multicharge separation structure consisting of a thin rubrene fluorescent dye for open circuit voltage enhancement
7.C. Tao, S. P. Ruan, G. H. Xie, X. Z. Kong, L. Shen, F. X. Meng, C. X. Liu, X. D. Zhang, W. Dong, and W. Y. Chen, Appl. Phys. Lett. 94, 043311 (2009).
10.B. Verreet, S. Schols, D. Cheyns, B. P. Rand, H. Gommans, T. Aernouts, P. Heremans, and J. Genoe, J. Mater. Chem. 19, 5295 (2009).
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Organic solar cells were fabricated by inserting a thin rubrene fluorescent dye between pentacene and fullerene heterojunction with a multicharge separation(MCS) structure, which was adopted to inherently further improve maximum open circuit voltage and power conversion efficiency. The morphology of organic films showed that a more surface roughness of pentacene film could be beneficial for an effective MCS interface, exciton dissociation, and charge carrier transportation. Moreover, a slight improvement of short-circuit current density when adding a 1 or 2 nm rubrene layer was also analyzed in detail based on external quantum efficiency spectra and optical transfer matrix theory.
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