Pentacene self-aggregation at the Au(110)-(1×2) surface: growth morphology and interface electronic states

Menozzi, Claudia; Corradini, Valdis; Cavallini, Massimiliano; Biscarini, Fabio; Betti, Maria Grazia; Mariani, Carlo

doi:10.1016/s0040-6090(02)01269-5

Cited by 49 publications

(35 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On Au(1 1 1) the first layer also grows lying flat on the surface, while it is standing upright on a polycrystaline Au substrate [137,138]. The molecules arrange in a striped pattern on the Au(1 1 0) surface [139]. This is in agreement with results on graphite, where also pentacene grows flat on well-ordered substrates, whereas it grows in an upright standing fashion on disordered substrates [140].…”

Section: Molecular Arrangement On the Surfacesupporting

confidence: 86%

Imaging prototypical aromatic molecules on insulating surfaces: a review

Hoffmann‐Vogel

2017

Rep. Prog. Phys.

View full text Add to dashboard Cite

Insulating substrates allow for in-plane contacted molecular electronics devices where the molecule is in contact with the insulator. For the development of such devices it is important to understand the interaction of molecules with insulating surfaces. As substrates, ionic crystals such as KBr, KCl, NaCl and CaF are discussed. The surface energies of these substrates are small and as a consequence intrinsic properties of the molecules, such as molecule-molecule interaction, become more important relative to interactions with the substrates. As prototypical molecules, three variants of graphene-related molecules are used, pentacene, [Formula: see text] and PTCDA. Pentacene is a good candidate for molecular electronics applications due to its high charge carrier mobility. It shows mainly an upright standing growth mode and the morphology of the islands is strongly influenced by dewetting. A new second flat-lying phase of the molecule has been observed. Studying the local work function using the Kelvin method reveals details such as line defects in the center of islands. The local work function differences between the upright-standing and flat-lying phase can only be explained by charge transfer that is unusual on ionic crystalline surfaces. [Formula: see text] nucleation and growth is explained by loosely bound molecules at kink sites as nucleation sites. The stability of [Formula: see text] islands as a function of magic numbers is investigated. Peculiar island shapes are obtained from unusual dewetting processes already at work during growth, where molecules 'climb' to the second molecular layer. PTCDA is a prototypical semiconducting molecule with strong quadrupole moment. It grows in the form of elongated islands where the top and the facets can be molecularly resolved. In this way the precise molecular arrangement in the islands is revealed.

show abstract

Section: Molecular Arrangement On the Surfacesupporting

confidence: 86%

Imaging prototypical aromatic molecules on insulating surfaces: a review

Hoffmann‐Vogel

2017

Rep. Prog. Phys.

View full text Add to dashboard Cite

show abstract

“…Nonetheless, the CuPc molecular bulk configuration is not reached: in fact, the Au structures are still visible, the highest occupied molecular orbital (HOMO) state, expected at ~1.3-1.5 eV binding energy (BE), is a weak feature, and the molecular levels at higher binding energy [17] are not detectable. The deposition of pentacene on the Au(110) surface at RT, gives rise to a similar behaviour of EDC as a function of the coverage [12,18]; from a structural point of view LEED pattern shows a first 2D ordered layer, while Atomic Force microscopy (AFM) images present the nucleation of three-dimensional (3D) linear stripes on top of the first layer [18]. Consistent with the Pentacene/Au interface results, the EDC data reported in this work can not exclude the formation of a 3D CuPc phase, leaving wide free patches of the underlying 2D ordered 28/03/2003 layer, though they are compatible as well with the existence of a saturation coverage, that is a sticking coefficient equal to zero.…”

Section: Resultsmentioning

confidence: 84%

“…There are several experimental and theoretical works accounting for a Au(110)-(1x3) reconstruction induced by atomic or molecular adsorption on the Au(110) surface. In particular, such a gold reconstruction has been observed upon alkali metals deposition [22] or even upon organic molecules adsorption [11,12,18]. Moreover, from theoretical calculations, it comes out that the (1x3) reconstructions is energetically close to the (1x2) [23], and both are highly energetically favored with respect to the (1x1) surface symmetry.…”

Section: Resultsmentioning

confidence: 95%

CuPc molecules adsorbed on Au(110)-(1×2): growth morphology and evolution of valence band states

et al. 2003

Self Cite

View full text Add to dashboard Cite

We present the growth morphology, the long range ordering, and the evolution of the valence band electronic states of ultra-thin films of copper phthalocyanine (CuPc) deposited on the Au(110)-(1x2) reconstructed surface, as a function of the organic molecule coverage. The Low Energy Electron Diffraction (LEED) patterns present a (5x3) reconstruction from the early adsorption stages. High-Resolution UV photoelectron spectroscopy (HR-UPS) data show the disappearance of the Au surface states related to the (1x2) reconstruction, and the presence of new electronic features related to the molecule-substrate interaction and to the CuPc molecular states. The CuPc highest occupied molecular orbital (HOMO) gradually emerges in the valence band, while the interface electronic states are quenched, upon increasing the coverage.

show abstract

“…3c), suggests that the decay of I d in time is not due to degradation of the material during the experiment. Here we used H 2 Pc as representative material; however our approach is general and can be extended to other liquid crystals and more in general to other classes of organic materials such as molecular [43,44] or polymeric [45,46] semiconductors.…”

Section: Discussionmentioning

confidence: 99%

Doping and photo-induced current in discotic liquid crystals thin films: Long-time and temperature effects

Calò¹,

Stoliar²,

Cavallini³

et al. 2011

Organic Electronics

Self Cite

View full text Add to dashboard Cite

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. b s t r a c tHere we address the problem of time and temperature instability of the electrical current related to parasitic doping effects in discotic liquid crystals (DLCs). We investigated the electrical transport in thin films of a phthalocyanine-based DLC in-dark and upon laser irradiation during long thermal cycles. Measuring the electrical transport between two electrodes we observed that in-dark the current is mostly due to doping levels while, upon laser irradiation, the photocurrent reflects the diffusion length of the photogenerated charge carriers and it is limited by the coherence length of a column. We prove here that the two contributions are completely independent. Our result experimentally supports the theoretical studies performed at the molecular level on discotic liquid crystals.

show abstract

Pentacene self-aggregation at the Au(110)-(1×2) surface: growth morphology and interface electronic states

Cited by 49 publications

References 18 publications

Imaging prototypical aromatic molecules on insulating surfaces: a review

Imaging prototypical aromatic molecules on insulating surfaces: a review

CuPc molecules adsorbed on Au(110)-(1×2): growth morphology and evolution of valence band states

Doping and photo-induced current in discotic liquid crystals thin films: Long-time and temperature effects

Contact Info

Product

Resources

About