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Köppe, Robert; Bossart, Olivia; Calzaferri, Gion; Sariciftci, Niyazi Serdar (2007). Advanced photon harvesting concepts for low energy gap organic solar cells. Solar energy materials and solar cells, 91(11), pp. 986-995. Amsterdam: North-Holland 10.1016/j.solmat.2007.01.008