1973
DOI: 10.1002/pssb.2220600144
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A model of the electrical transport phenomena in imperfect crystals of copper phthalocyanine II. Surface States of Phthalocyanine Single Crystals

Abstract: Starting from real grown crystals and their habit the binding energies of a molecule for different crystal directions are estimated and some ideas about the electronic surface morphology are given. The high concentration of lattice defects on the surface causes their interaction which leads to a quasicontinuous energetic distribution of traps. The microstructure of the distribution can be referred to the geometry of the crystal lattice. The theoretical resulte agree excellently with the experiments.Ausgehend v… Show more

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Cited by 13 publications
(9 citation statements)
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“…It means that one cannot exclude the possibility that the surface sensitive lattice defects are responsible for the filled electronic states observed in the band gap of copper phthalocyanine (CuPc) thin films. The filled gap states have already been predicted theoretically for thin films as well as the crystalline surface of copper phthalocyanine (CuPc) by Hamann and Lehmann [25,261 and were also attributed to surface sensitive lattice defects of high concentration.…”
Section: Resultsmentioning
confidence: 89%
“…It means that one cannot exclude the possibility that the surface sensitive lattice defects are responsible for the filled electronic states observed in the band gap of copper phthalocyanine (CuPc) thin films. The filled gap states have already been predicted theoretically for thin films as well as the crystalline surface of copper phthalocyanine (CuPc) by Hamann and Lehmann [25,261 and were also attributed to surface sensitive lattice defects of high concentration.…”
Section: Resultsmentioning
confidence: 89%
“…The surface energy quantifies the disruption of chemical bonds that occurs when a surface is created, thus we expect a larger surface energy for lying molecules, where the -interaction is disrupted at the surface. 26,27 The data for the film thicknesses above 1 nm can represent a film, where the molecules are increasingly rearranged. In this case ͑scenario A͒, the trend of the intensity curves in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…40 For higher coverages the moleculesubstrate interaction becomes negligible, and the intermolecular interaction and surface energy of the molecular film become the structure-determining parameters. 22,23,26 The molecules may form stacks parallel to the sample surface consisting of standing molecules, as the interfacial layers act like a van-der-Waals substrate similar to hydrogenpassivated silicon. 41,42 In summary, we have provided evidence for the persistence of a buried interfacial layer of approximately 3 ML of well oriented lying PcCu molecules on a polycrystalline gold substrate.…”
Section: Resultsmentioning
confidence: 99%
“…The energy scale, the origin of which lies at the valence band edge, is directed to increasing electron energies. Since states G. LERMANN and C. HAMANN with W < 0 and W > W, should not be considered, (2) …”
Section: Basic Equation and Evaluation Methodsmentioning
confidence: 98%
“…the constants A , a, B, and b are determined by fitting to equation (9) of [ 2 ] . N follows from the equation real samples have to be characterized by discrete trap levels in the bulk and a continuous trap distribution on interfaces.…”
Section: The Permi Energy For a Quasi-continuous Trap Distributionmentioning
confidence: 99%