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

Characterization of PTCDA nanocrystals on Ge(001):H-(2×1) surfaces

“…These islands are frequently higher than their hexagonal counterparts, and may scale up to 4 nm. The hexagonal shape of the islands is quite similar to the general shape of PTCDA nanocrystals observed on noble metals [32], on Si(1 0 0):H [31] and Si (1 1 1):H [30] surfaces.…”

“…PTCDA molecules have been characterized on various substrates with use of many experimental techniques [22][23][24][25][26][27][28][29][30][31][32] due to the fact that they exhibit high thermal stability and robustness against electron and photon bombardment. They are regarded as prototypical organic semiconductors and planar stacking molecules [22,23].…”

“…Because of the fact that PTCDA is an intensive dye molecule [33] thin layers of these molecules are utilized in optoelectronic devices. Among others, there are experimental reports on growth of PTCDA molecules on hydrogen passivated silicon surfaces, Si(1 1 1):H [29,30] and Si(0 0 1):H [31], describing growth of nanocrystalline molecular islands. In the case of PTCDA/Si(0 0 1):H system the observed islands predominantly exhibit an irregular hexagonal shape and the evolution of their growth depends on the density of unsaturated dangling bonds (DB's) in the passivating layer [31].…”

Transient Grating Studies of Femtosecond Processes in Ultra‐Thin Layers of PTCDA

“…The islands in our films show similar features as the PTCDA films on hydrogen-terminated Si(111) by Sazaki et al [12] The Volmer-Weber growth mode is assumed for the growth of islands as they consist of monocrystals [with six sharp facets as shown in inset (ii) of Figure 2 a] [13] as well as polycrystals [shown in inset (i) of Figure 2 a], formed by the coalescence of smaller crystals. About 41 % of the islands observed in the AFM image are monocrystals, indicating that Oswald ripening, a phenomenon in which a larger crystal grows by "eating up" smaller ones, occurs during the layer growth.…”

Imaging perylene derivatives on rutileTiO2(110)by noncontact atomic force microscopy

“…Besides 3,4,9,10-perylene tetracarboxylic acid-dianhydride ͑PTCDA͒, a great number of other perylene derivatives have been studied, including 3,4,9,10-perylene tetracarboxylic diimine ͑PTCDI͒. 4,5 These molecules have been deposited on various conducting surfaces including Ag, Au, Cu, and highly oriented pyrolytic graphite [6][7][8][9][10][11][12][13][14][15][16][17][18] as well as semiconducting [19][20][21][22] and insulating substrates such as KBr, KCl, NaCl, and mica. [23][24][25][26][27][28] Titanium dioxide plays a prominent role due to its promising properties for a wide range of various applications such as catalysis and solar cells.…”