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cluster formation at interfaces with pentacene thin-film phases
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14.Qualitatively similar growth on mica has also been demonstrated in T. Bonnen, A. Schuldenfrei, and S. W. Robey (unpublished).
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The -thin film pentacene interface was investigated using scanning tunneling microscopy,atomic force microscopy, and ultraviolet photoemission spectroscopy. deposition on a multilayer pentacene film (standing) yields an interface dominated by clusters, regardless of the underlying substrate. Three-dimensional cluster growth dominates due to weak interactions with the underlying Pn. cluster size and density on sequential Pn layers suggest an Ehrlich–Schwoebel-type barrier at Pn layer boundaries. Cluster formation reduces the lowest unoccupied molecular orbital–Pn highest occupied molecular orbital (HOMO) separation, while increasing the respective HOMO-HOMO offset. Heterostructure fabrication protocols can alter interface morphology and induce band shifts on the order of 0.3 eV.
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