STM and XPS characterization of zinc phthalocyanine on InSb(001)

Nilson, Katharina; Palmgren, Pål; Åhlund, John; Schiessling, Joachim; Göthelid, Emmanuelle; Mårtensson, Nils; Puglia, Carla; Göthelid, Mats

doi:10.1016/j.susc.2007.10.052

Cited by 33 publications

(19 citation statements)

References 36 publications

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“…59 However, the metal surface holescreening is not completely comparable to the system reported here, since TiO 2 is a semiconductor and such large shifts from hole-screening effects for organic molecules on semiconductors is less likely. 15,18,20,58 Also, the present study does not support any dramatic change in molecular orientation between the different depositions, which indicate that the hole screening within the organic layer is also rather similar for the different thicknesses. We also note, in the case of a dominating hole-screening effect, that the shifts should be different depending on whether the hole is in a core or valence orbital.…”

Section: Electronic Energy Matchingcontrasting

confidence: 75%

Interface electronic states and molecular structure of a triarylamine based hole conductor on rutile TiO2(110)

Johansson

Odelius

Karlsson

et al. 2008

The Journal of Chemical Physics

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The molecular and electronic surface structure of a triarylamine based hole-conductor (HC) molecule evaporated onto rutile TiO2(110) single crystal is investigated by means of synchrotron light based photoelectron spectroscopy and x-ray absorption spectroscopy in combination with calculations based on density functional theory. Different amounts of the HC molecule was evaporated spanning the monolayer to multilayer region. The molecular surface structure is investigated and the results indicate that no specific covalent chemical bonding is formed and that the plane formed by the different nitrogens in the HC molecules has a rather small angle versus the TiO2 substrate surface plane. Some molecular ordering also persists in the multilayer region. The experimental core level spectra, valence level spectra, and the N 1s x-ray absorption spectroscopy spectra are well modeled by calculations on an individual molecule. Interestingly, the formation of the TiO2HC interface results in significant binding energy shifts in core levels and valence levels shifting all peaks of a the HC material to the same extent. Smaller shifts were also observed in the substrate core level peaks. The shift is discussed in terms of nanoscale energy level bending and final state hole screening. With respect to electronic applications, specifically in a solid state dye-sensitized solar cell, it is argued that the observed energy level alignment at the TiO2HC interface can act as a hole trap.

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Section: Electronic Energy Matchingcontrasting

confidence: 75%

Interface electronic states and molecular structure of a triarylamine based hole conductor on rutile TiO2(110)

Johansson

Odelius

Karlsson

et al. 2008

The Journal of Chemical Physics

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“…3. Since there are 24 benzene carbons and 8 pyrrole carbons in a CuPc molecule, the areal ratio of the C b and C p peaks is 3:1, which is in agreement with Nilson et al 27 The core level shifts of the InP substrate, C 60 , and CuPc overlayers are summarized in Fig. 4.…”

Section: B Inp/ C 60 / Cupc Interfacesupporting

confidence: 89%

Interfacial electronic structure of a hybrid organic-inorganic optical upconverter device: The role of interface states

Tsai

Helander

2009

Journal of Applied Physics

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Energy-level alignment and charge injection at metal/ C 60 /organic interfaces Appl. Phys. Lett. 95, 043302 (2009); Organic-inorganic hybrid heterojunctions are critical for the integration of organic electronics with traditional Si and III-V semiconductor microelectronics. The amorphous nature of organic semiconductors eliminates the stringent lattice-matching requirements in semiconductor monolithic growth. However, as of yet it is unclear what driving forces dictate the energy-level alignment at hybrid organic-inorganic heterojunctions. Using photoelectron spectroscopy we investigate the energy-level alignment at the hybrid organic-inorganic heterojunction formed between S-passivated InP͑100͒ and several commonly used hole injection/transport molecules, namely, copper phthalocyanine ͑CuPc͒, N , NЈ-diphenyl-N , NЈ-bis-͑1-naphthyl͒-1-1Ј-biphenyl-4,4Ј-diamine ͑␣-NPD͒, and fullerene ͑C 60 ͒. The energy-level alignment at the hybrid organic-inorganic heterojunction is found to be consistent with traditional interface dipole theory, originally developed to describe Schottky contacts. Contrary to conventional wisdom, hole injection from S-passivated InP͑100͒ into an organic semiconductor is found to originate from interface states at or near the Fermi level, rather than from the valance band maximum of the semiconductor. As a result the barrier height for hole injection is defined by the offset between the surface Fermi level of the S-passivated InP͑100͒ and the highest occupied molecular orbital of the organic. This finding sheds new light on the unusual trend in device performance reported in literature for such hybrid organic-inorganic heterojunction devices.

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“…[52][53][54][55][56][57] This is also the case for FePc on Au(111), on which it forms ordered monolayer structures with the planar FePc molecules lying flat on the surface (see supplementary information 41 ). The bond between the macrocycle part of the FePc molecules and Au substrate is expected to be largely characterized by van der Waals interactions.…”

Section: A Fepc Monolayer On Au(111)mentioning

confidence: 83%

Ammonia adsorption on iron phthalocyanine on Au(111): Influence on adsorbate–substrate coupling and molecular spin

Isvoranu

Wang

Ataman

et al. 2011

The Journal of Chemical Physics

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The adsorption of ammonia on Au(111)-supported monolayers of iron phthalocyanine has been investigated by x-ray photoelectron spectroscopy, x-ray absorption spectroscopy, and density functional theory calculations. The ammonia-induced changes of the x-ray photoemission lines show that a dative bond is formed between ammonia and the iron center of the phthalocyanine molecules, and that the local spin on the iron atom is quenched. This is confirmed by density functional theory, which also shows that the bond between the iron center of the metalorganic complex and the Au (111) substrate is weakened upon adsorption of ammonia. The experimental results further show that additional adsorption sites exist for ammonia on the iron phthalocyanine monolayer.

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STM and XPS characterization of zinc phthalocyanine on InSb(001)

Cited by 33 publications

References 36 publications

Interface electronic states and molecular structure of a triarylamine based hole conductor on rutile TiO2(110)

Interface electronic states and molecular structure of a triarylamine based hole conductor on rutile TiO2(110)

Interfacial electronic structure of a hybrid organic-inorganic optical upconverter device: The role of interface states

Ammonia adsorption on iron phthalocyanine on Au(111): Influence on adsorbate–substrate coupling and molecular spin

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