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The growth of para-sexiphenyl (6P) thin films as a function of substratetemperature on Ir{111} supported graphene flakes has been studied in real-timewith Low Energy Electron Microscopy (LEEM). Micro Low Energy ElectronDiffraction (\mu LEED) has been used to determine the structure of thedifferent 6P features formed on the surface. We observe the nucleation andgrowth of a wetting layer consisting of lying molecules in the initial stagesof growth. Graphene defects -- wrinkles -- are found to be preferential sitesfor the nucleation of the wetting layer and of the 6P needles that grow on topof the wetting layer in the later stages of deposition. The molecular structureof the wetting layer and needles is found to be similar. As a result, only alimited number of growth directions are observed for the needles. In contrast,on the bare Ir{111} surface 6P molecules assume an upright orientation. Theformation of ramified islands is observed on the bare Ir{111} surface at 320 Kand 352 K, whereas at 405 K the formation of a continuous layer of uprightstanding molecules growing in a step flow like manner is observed.

The influence of substrate temperature on growth of para-sexiphenyl thin films on Ir{111} supported graphene studied by LEEM