Photovoltaic limitations of BODIPY:fullerene based bulk heterojunction solar cells - Baran, D; Tuladhar, S; Economopoulos, SP; Neophytou, M; Savva, A; Itskos, G; Othonos, A; Bradley, DDC; Brabec, CJ; Nelson, J; Choulis, SA (SYNTHETIC METALS, 2017)