Understanding and optimising the packing density of perylene bisimide layers on CVD-grown graphene - Berner, Nina C.; Winters, Sinead; Backes, Claudia; Yim, Chanyoung; Duembgen, Kim C.; Kaminska, Izabela; Mackowski, Sebastian; Cafolla, Attilio A.; Hirsch, Andreas; Duesberg, Georg S. (Nanoscale, 2015)