Full characterization of the interface between the organic semiconductor copper phthalocyanine and gold

Peisert, Heiko; Knupfer, M.; Schwieger, T.; Auerhammer, J.; Golden, M. S.; Fink, J.

doi:10.1063/1.1459620

Cited by 232 publications

(173 citation statements)

References 21 publications

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“…Semiconductor-organic (S-O) 12,18 and M-O (Ref. 14) interfaces were characterized by thickness dependent studies starting with ultrathin CuPc coverages in the (sub-)monolayer range up to bulk-like thicknesses (~20 nm). However, this is only half of a typical device structure.…”

Section: Introductionmentioning

confidence: 99%

Transport band gap opening at metal–organic interfaces

Haidu

Salvan

Zahn

et al. 2014

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The interface formation between copper phthalocyanine (CuPc) and two representative metal substrates, i.e., Au and Co, was investigated by the combination of ultraviolet photoelectron spectroscopy and inverse photoelectron spectroscopy. The occupied and unoccupied molecular orbitals and thus the transport band gap of CuPc are highly influenced by film thickness, i.e., molecule substrate distance. Due to the image charge potential given by the metallic substrates the transport band gap of CuPc "opens" from (1.4 ± 0.3) eV for 1 nm thickness to (2.2 ± 0.3) eV, and saturates at this value above 10 nm CuPc thickness. The interface dipoles with values of 1.2 eV and 1.0 eV for Au and Co substrates, respectively, predominantly depend on the metal substrate work functions. X-ray photoelectron spectroscopy measurements using synchrotron radiation provide detailed information on the interaction between CuPc and the two metal substrates. While charge transfer from the Au or Co substrate to the Cu metal center is present only at sub-monolayer coverages, the authors observe a net charge transfer from the molecule to the Co substrate for films in the nm range. Consequently, the Fermi level is shifted as in the case of a p-type doping of the molecule. This is, however, a competing phenomenon to the energy band shifts due to the image charge potential.

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Section: Introductionmentioning

confidence: 99%

Transport band gap opening at metal–organic interfaces

Haidu

Salvan

Zahn

et al. 2014

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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“…3,4 Their chemical and thermal stability has permitted studies in ultra high vacuum (UHV) environments resulting in many spectroscopic investigations. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] The possibility to modify the electronic structure of the molecular film allows the tuning of specific properties and this is clearly highly desired to further improve the performance of Pc-based devices. For this reason, the interesting results reported by Craciun et al 19 and already predicted by a theoretical study by Tosatti et al 20 about the observation of an insulator-to-metal transition of Pc films upon alkali intercalation (between 0 and 4 K atoms per molecule) have inspired a number of studies.…”

Section: Introductionmentioning

confidence: 99%

Potassium-intercalated H2Pc films: Alkali-induced electronic and geometrical modifications

Åhlund

Shariati

Schiessling

et al. 2012

The Journal of Chemical Physics

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Potassium-intercalated H2Pc filmsNilson, K.; Ahlund, J.; Shariati, M. -N.; Schiessling, J.; Palmgren, P.; Brena, B.; Gothelid, E.; Hennies, F.; Huismans, Y.; Evangelista, F. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. X-ray spectroscopy studies of potassium intercalated metal-free phthalocyanine multilayers adsorbed on Al(110) have been undertaken. Photoelectron spectroscopy measurements show the presence of several charge states of the molecules upon K intercalation, due to a charge transfer from the alkali. In addition, the comparison of valence band photoemission spectra with the density functional theory calculations of the density of states of the H 2 Pc − anion indicates a filling of the formerly lowest unoccupied molecular orbital by charge transfer from the alkali. This is further confirmed by x-ray absorption spectroscopy (XAS) studies, which show a decreased density of unoccupied states. XAS measurements in different experimental geometries reveal that the molecules in the pristine film are standing upright on the surface or are only slightly tilted away from the surface normal but upon K intercalation, the molecular orientation is changed in that the tilt angle of the molecules increases.

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“…Copper phthalocyanine (CuPc) is a model system for an entire class of low molecular weight, flat, organic molecules 13 . Thick ordered phthalocyanine films have been grown on various substrates [14][15][16][17] and the adsorption behaviors of CuPc molecules on Si(111) and Si(100) 18,19 have been previously studied by scanning tunneling microscopy (STM).…”

Section: Introductionmentioning

confidence: 99%

Molecular Orientation and Ordering during Initial Growth of Copper Phthalocyanine on Si(111)

Wang

Liu

et al. 2007

J. Phys. Chem. C

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RECEIVED DATE (to be automatically inserted after your manuscript is accepted if required according to the journal that you are submitting your paper to)The molecular orientation and order in the initial growth of copper phthalocyanine on Si(111) was investigated in-situ by angular-dependent X-ray absorption spectroscopy. A transition from lying-down to standing-up configuration occurs in less than one monolayer. After the Si surface is passivated by a monolayer of the molecules, only the standing-up structure persists in subsequent growth. The molecular film also exhibits an order-disorder-order transition in the distribution of molecular tilt angle during growth. These transitions are related to the changes of interactions in the system at different stages.

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Full characterization of the interface between the organic semiconductor copper phthalocyanine and gold

Cited by 232 publications

References 21 publications

Transport band gap opening at metal–organic interfaces

Transport band gap opening at metal–organic interfaces

Potassium-intercalated H2Pc films: Alkali-induced electronic and geometrical modifications

Molecular Orientation and Ordering during Initial Growth of Copper Phthalocyanine on Si(111)

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