STM study of the organic semiconductor PTCDA on highly-oriented pyrolytic graphite

Kendrick, Chito; Kahn, Antoine; Forrest, S. R.

doi:10.1016/s0169-4332(96)00207-3

Cited by 68 publications

(70 citation statements)

References 19 publications

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“…Along the long symmetry axis, the molecules are tilted by 11°with respect to the (102) plane. 15,16 In thin films grown on substrates like Ag(111), 17 Au(111), 18 and highly oriented pyrolitic graphite, 19 PTCDA is adsorbed in a "herringbone" structure, with two molecules in each unit cell almost perpendicular to each other and parallel to the substrate surface. This arrangement of the molecules is similar to the one in the (102) plane of a PTCDA crystal.…”

Section: Introductionmentioning

confidence: 99%

Exciton emission in PTCDA films andPTCDA∕Alq3multilayers

2004

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We investigate the exciton emission in 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) thin films and PTCDA/aluminium-tris-hydroxyqinoline ͑Alq 3 ͒ multilayers by photoluminescence spectroscopy in the temperature range from 10 to 300 K. The films are grown by organic molecular beam deposition on Si (001) and Pyrex™ substrates at high vacuum. The obtained temperature dependence of the different recombination channels arising from indirect Frenkel excitons, charge transfer excitons, excimers, and relaxed excited monomers is compared to the recombination channels in single PTCDA crystals. A strong recombination band is observed at 1.63 eV in PTCDA/ Alq 3 multilayers. This emission band is attributed to charge transfer transitions between stacked PTCDA molecules that are compressed by strain fields within the PTCDA layers. This assignment is supported by strain-dependent photoluminescence measurements on pure PTCDA films.

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Section: Introductionmentioning

confidence: 99%

Exciton emission in PTCDA films andPTCDA∕Alq3multilayers

2004

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“…Surface-sensitive techniques such as scanning tunnelling microscopy (STM) and low-energy electron diffraction (LEED) are used to characterize the thin organic films. Thin PTCDA films have been studied on different substrates, such as HOPG [1,2], Au(111) [3,4], Au(100) [5], Ag(111) [6,7], Ag(110) [8], GaAs(100) [9] and InAs(001) [10]. It was found that PTCDA forms well-ordered layers.…”

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confidence: 99%

Growth of 3,4,9,10-perylenetetracarboxylic-dianhydride (PTCDA) on Cu(110) studied by STM

2002

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Abstract. The structure of thin 3,4,9,10-perylenetetracarboxylic-dianhydride (PTCDA) films on Cu(110) was studied by scanning tunnelling microscopy (STM) from submonolayer to monolayer coverage. While no long-range ordering was found after deposition at room temperature, the formation of a well-defined superstructure is observed after thermal annealing. It appears that the formation of the superstructure is driven by the interaction between the oxygen atoms of the PTCDA and the copper atoms of the substrate. While the distance between the molecules fits well to the atomic lattice of the Cu(110) surface along the [110] direction, the mismatch along the [001] direction leads to a periodic buckling normal to the surface accompanied by a restructuring of the substrate.

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“…The next rows appear rotated, as is typical for the PTCDA structure. Other authors have identified this structure on different substrates [8] and the internal structure of individual molecules, observed in the STM images, has been correlated with molecular orbital calculations for the PTCDA molecule [17].…”

Section: Nmmentioning

confidence: 65%

Preparation and passivation of GaAs(001) surfaces for growing organic molecules

et al. 2002

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Growth of ordered organic films of 3, 4, 9, 10-perylene-tetracarboxylic-dianhydride (PTCDA), on inorganic substrates of GaAs (001) is investigated by means of low-energy electron diffraction, scanning tunnelling microscopy and atomic force microscopy. The passivation of the sample can be achieved by exposing the substrate to sulphur (the SnS 2 compound) or wet-chemical etching using an S-containing etchant (S 2 Cl 2 ). The sulphur-treated surfaces are less reactive and are suitable as substrates for the growth of epitaxial films. In this work we have compared the growth of organic molecules on substrates prepared by two different methods. The samples prepared by molecular beam epitaxy (MBE) present smoother surfaces compared with chemically treated samples. Therefore, an improvement of the PTCDA molecular order is observed for the MBE samples, which exhibit the formation of crystals.

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STM study of the organic semiconductor PTCDA on highly-oriented pyrolytic graphite

Cited by 68 publications

References 19 publications

Exciton emission in PTCDA films andPTCDA∕Alq3multilayers

Exciton emission in PTCDA films andPTCDA∕Alq3multilayers

Growth of 3,4,9,10-perylenetetracarboxylic-dianhydride (PTCDA) on Cu(110) studied by STM

Preparation and passivation of GaAs(001) surfaces for growing organic molecules

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