Flux-Selected Titanyl Phthalocyanine Monolayer Architecture on Ag (111)

Wei, Yinying; Robey, S. W.; Reutt‐Robey, Janice

doi:10.1021/jp8063678

Cited by 42 publications

(81 citation statements)

References 41 publications

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“…The other configuration presents a four-lobed structure with a central depression, referring to TiOPc-dep configuration. Different to the adsorption on Ag(111) surface at room temperature, on which TiOPc molecules adsorbed in a tilted configuration and exhibited a three-lobe shape in STM images [19,20], the four-lobed "cross" structure of the two configurations on the Cu(111) surface is consistent with the chemical structure of TiOPc molecule and indicates a flat-lying adsorption configuration.…”

Section: Resultsmentioning

confidence: 76%

Orientation of molecular interface dipole on metal surface investigated by noncontact atomic force microscopy

et al. 2013

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We investigated the orientations of interface dipole moments of individual non-planar titanyl phthalocyanine (TiOPc) molecules on Cu(111) and Cu(100) substrates using scanning tunneling microscope (STM) and noncontact atomic force microscope (NC-AFM). The dipole moment orientations corresponding to two different configurations of individual TiOPc molecules were determined unambiguously. The correlation between the actual molecular structures and the corresponding STM topographies is proposed based on the sub-molecular resolution imaging and local contact potential difference (LCPD) measurements. Comparing with the pristine substrate, the LCPD shift due to the adsorption of non-planar molecule is dependent on the permanent molecular dipole, the charge transfer between the surface and the molecule, and the molecular configurations. This work would shed light on tailoring interfacial electronic properties and controlling local physical properties via polar molecule adsorption. titanyl phthalocyanine, interface dipole, non-contact atomic force microscopy, scanning tunneling microscopy, Kelvin probe force microscopy Citation:Yuan B K, Chen P C, Zhang J, et al. Orientation of molecular interface dipole on metal surface investigated by noncontact atomic force microscopy. Chin Sci Bull, 2013Bull, , 58: 36303635, doi: 10.1007 Interface dipoles induced by self-assembly of organic molecules on metal surfaces play an important role in controlling the surface and/or interface properties, especially in the modification of work function of the metal substrate and the energy-level alignment of organic semiconductor with the metal Fermi level [1,2]. Interface dipole is strongly influenced by the permanent dipole of the organic molecule and the "bonding" dipole induced by the molecule-metal interaction [3][4][5][6]. To understand the energy-level alignment at the interface and design interfaces with desired properties, atomic level investigations on the molecular structures of organic adsorbates and interfacial electronic structures are highly required and challenging. Metal phthalocyanines (MPcs), together with their derivatives, have attracted great interest over the past years because of their unique optical and electrical properties [7]. Non-planar MPcs, such as titanyl phthalocyanine (TiOPc), tin phthalocyanine (SnPc) [8], vanadyl phthalocyanine (VOPc) [9,10], chloroaluminum phthalocyanine (ClAlPc) [5] and chlorogallium phthalocyanine (GaClPc) [3], may adsorb on metal surface with two opposite molecular orientations, which give rise to different dipole moments ( Figure 1(b)). Different adsorption configurations have significant influence on the functionalities of molecules and surface and/or interface properties. However, the studies on the effects of the non-planar molecular structure and interfacial electronic structure on interface dipole are still limited. It is thus important to investigate the charge redistribution across the molecule and the metal substrate and to determine the orientations of interface dipole mome...

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Section: Resultsmentioning

confidence: 76%

Orientation of molecular interface dipole on metal surface investigated by noncontact atomic force microscopy

et al. 2013

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“…Pure (O)TiPc↑ island were found on Cu(1 1 1) above 0.8 ML [213]. On Ag(1 1 1), the orientation seemed to depend on the preparation conditions, as indicated by reports of oxygen-up orientation [212], mixed orientation [213], and tilted molecules [208]. Oxygen-up orientation was also reported for (O)VPc on Fe, Co and Ni films on Cu (0 0 1) [214], while an oxygen-down orientation was found on Si (1 1 1)-(7 Â 7) [212].…”

Section: Adsorption Of Simple Metallophthalocyanines On Metalsmentioning

confidence: 94%

“…(O)TiPc on Au(1 1 1) formed a square lattice of flat-lying molecules with local point-on-line coincident epitaxy [207]. On Ag(1 1 1), various adsorbate structures were observed depending on the preparation conditions, such as the flux during deposition, including a honeycomb pattern of tilted interlocked pairs and a hexagonal phase with tilted molecules [208]. Flat-lying molecules with oxygen-up and oxygen-down orientations were also observed in Ag(1 1 1), with (O)TiPc↑ and (O)TiPc↓ showing distinct differences in the azimuthal orientation and the molecular chirality [209].…”

Section: Adsorption Of Simple Metallophthalocyanines On Metalsmentioning

confidence: 99%

Surface chemistry of porphyrins and phthalocyanines

Gottfried

2015

Surface Science Reports

583

586

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“…Much of the research in this area has been carried out on single crystal coinage metal surfaces while binary metal oxides represent a much smaller part of the literature. [15][16][17][18] The behaviour of non-planar MPc molecules, in particular vanadyl phthalocyanine (VOPc), on ZnO surfaces has to our knowledge not previously been investigated. VOPc has a permanent electric dipole moment, a feature which is not present in any of the planar MPc molecules.…”

Section: Introductionmentioning

confidence: 99%

The influence of polar (0001) zinc oxide (ZnO) on the structure and morphology of vanadyl phthalocyanine (VOPc)

et al. 2015

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Metal oxide thin films are increasingly utilized in small molecular organic photovoltaic devices to facilitate electron transport and injection. Despite this there is little understanding of the influence these layers have on the structure of adjacent organic semiconductor layers. Here we use both O-and Zn-terminated (0001) single crystal zinc oxide (ZnO) as a model system to investigate the effect of a metal oxide surface on the growth of a molecular semiconductor, vanadyl phthalocyanine (VOPc). The surface reconstructions of these model surfaces are determined and the properties of thin films of VOPc deposited atop are investigated. The nature of the bulk truncation of the surface is found to have pronounced effects on both the morphology and crystal structure of these molecular films. This work highlights the importance of considering the effects of the chemical composition and surface termination of metal oxide films on the structure of adjacent molecular semiconductor films.

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Flux-Selected Titanyl Phthalocyanine Monolayer Architecture on Ag (111)

Cited by 42 publications

References 41 publications

Orientation of molecular interface dipole on metal surface investigated by noncontact atomic force microscopy

Orientation of molecular interface dipole on metal surface investigated by noncontact atomic force microscopy

Surface chemistry of porphyrins and phthalocyanines

The influence of polar (0001) zinc oxide (ZnO) on the structure and morphology of vanadyl phthalocyanine (VOPc)

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