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“Decreased recombination through the use of a non-fullerene acceptor in a 6.4% efficient organic planar heterojunction solar cell,” B. Verreet, K. Cnops, D. Cheyns, P. Heremans, A. Stesmans, G. Zango, C.G. Claessens, T. Torres, B.P. Rand, Adv. Energy Mater., 4, 1301413 (2014).