Layer-by-layer quasi-epitaxial growth of a crystalline organic thin film

Intermolecular vs molecule–substrate interactions: A combined STM and theoretical study of supramolecular phases on graphene/Ru(0001)

“…Even in the sub-monolayer regime, the molecules arrange in a periodic herringbone-like arrangement (Fig. 5), similar to the phases described for other substrates such as HOPG [27–29] and various metal substrates such as Au(111) [30–34], Ag(110) [35] or Cu(110) [36]. In contrast to the weakly interacting BTP molecules, the PTCDA adlayer covers the entire surface, i.e., the PTCDA molecules follow the up and down of the moiré superstructure of the graphene/Ru(0001) layer (Fig.…”

Epitaxial relation and island growth of perylene-3.4.9.10-tetracarboxylic dianhydride (PTCDA) thin film crystals on a hydrogen-terminated Si(1 1 1) substrate

“…film crystals has a widely stretched structure (tensile deformation) on the H-Si(1 1 1) surface. In the case of PTCDA thin film crystals on Au(1 1 1) surfaces, Fenter et al reported that the thin film crystal has a lattice strain of 3.8% and this strain decreases rapidly with an increase in the film thickness [7,9]. Thus a lattice strain probably exists also in the PTCDA thin film crystals on the H-Si(1 1 1) surface, and the larger tensile deformation of the thin film crystals on the H-Si(1 1 1) than that on the Au(1 1 1) presumably causes the island growth of Volmer-Weber type, like in the case of the heteroepitaxial growth of inorganic semiconductor thin film crystals [19,20].…”

“…As a model organic semiconductor to study the effects of such the parameters on the thin film growth, we chose perylene-3.4.9.10-tetracarboxylic dianhydride (PTCDA), since many studies have been so far reported that epitaxial PTCDA thin film crystals can be easily grown on many kinds of substrates, such as graphite [2][3][4][5][6], Au(1 1 1) [7][8][9][10], Cu(1 1 0) [11], alkali halides [12], etc. H-Si(1 1 1) surface was chosen as a model substrate since this surface is chemically inert and stable even in air [13].…”

Studies of photosensitivity and photo-induced negative differential resistance (NDR) of TIPS-pentacene-poly(3-hexyl)thiophene blend organic thin film transistor

“…The sub-threshold behavior of the drain current is attributed to the distribution of defect states in the band gap. The inverse sub-threshold slope SS for organicthin film transistor can be defined as [39]:…”