Understanding and controlling the weakly interacting interface in $\text{perylene}∕\mathrm{Ag}(110)$

Understanding and controlling the weakly interacting interface in $perylene ∕ Ag (110)$

L. Gao, Z. T. Deng, W. Ji, X. Lin, Z. H. Cheng, X. B. He, D. X. Shi, and H.-J. Gao

Phys. Rev. B 73, 075424 – Published 16 February 2006

Abstract

The weakly interacting interface, perylene on Ag(110), has been systematically investigated in detail with molecular-beam epitaxy and low-energy-electron diffraction (LEED), low-temperature-scanning-tunneling microscopy (STM), and first-principles calculations. The overall process of perylene monolayer growth has been clearly discussed by LEED and STM. The monolayer structure is sensitive to growth conditions because perylene has a poor self-assembly ability on Ag(110). However, we achieved the control of the formation of the uniform perylene monolayer composed of only one superstructure. The locally distributed metastable structures produced on certain growth conditions were also discussed.

Received 28 August 2005

DOI:https://doi.org/10.1103/PhysRevB.73.075424

Authors & Affiliations

L. Gao, Z. T. Deng, W. Ji, X. Lin, Z. H. Cheng, X. B. He, D. X. Shi, and H.-J. Gao^*

Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China

^*Electronic address: hjgao@aphy.iphy.ac.cn

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Vol. 73, Iss. 7 — 15 February 2006

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Figure 1
(Color online) (a) STM image $(30 nm \times 12 nm, U = - 1.7 V, I = 0.09 nA)$ of the initial adsorption stage of perylene on Ag(110) surface. The attached curve is the line profile (from A to B in STM image) across a molecule adsorbed along the [001] step edge. (b) STM image $(35 nm \times 35 nm, U = - 1.8 V, I = 0.04 nA)$ showing the scenario after one submono-layer, with a molecular coverage of $3.1 \times 10^{13} molecules per {cm}^{2}$ , was cooled down to 7 K. The inset shows the LEED pattern (12 eV) of this sample. (c) STM image $(35 nm \times 35 nm, U = - 1.7 V, I = 0.11 nA)$ showing the scenario after another submonolayer, with a molecular coverage of $4.6 \times 10^{13} molecules per {cm}^{2}$ , was cooled down to 77 K. The inset shows the LEED pattern (12eV) of this sample.Reuse & Permissions
Figure 2
(Color online) (a) LEED pattern of a highly ordered perylene monolayer. The beam energy is 33 eV. The diffraction spots of the perylene superstructure are symmetric with respect to the two directions indicated in the image. (b) The structural relation between the perylene superstructure and the silver substrate in real space. The adsorption sites of perylene molecules are arbitrarily chosen. $b_{1} = 4 a_{1} + a_{2}$ , $b_{2} = a_{1} + 3 a_{2}$ , $b_{1} = 16 Å$ and $b_{2} = 15 Å$ .Reuse & Permissions
Figure 3
(Color online) (a) STM image $(115 nm \times 115 nm, U = - 1.7 V, I = 0.08 nA)$ of the highly ordered perylene monolayer without any domain boundaries. (b) High-resolution STM image $(30 nm \times 30 nm, U = - 0.9 V, I = 0.21 nA)$ showing the domain boundaries.Reuse & Permissions
Figure 4
(Color online) Schematic diagrams for the optimization of perylene supercells on Ag(110). (a) Seven supposed adsorption configurations of single molecule with different adsorption sites (A–F). They are all adsorbed in “lying-flat” mode with their long axis along the $[1 \bar{1} 0]$ direction of the Ag(110) surface. $U$ and $L$ represent the upper and lower atoms in the first layer of the Ag(110) surface, respectively. (b) The molecular configuration of the optimized S-B perylene supercell. (c) The molecular configuration of the optimized S-D perylene supercell.Reuse & Permissions
Figure 5
(Color online) (a) The model of the favorable superstructure S-B obtained with energy optimization. (b) Simulated STM image $(- 1.2 V)$ of perylene S-B superstructure. (c) Experimental STM image $(4 nm \times 4 nm, U = - 1.2 V, I = 0.13 nA)$ of perylene superstructure.Reuse & Permissions
Figure 6
(Color online) (a) The STM image $(6 nm \times 6 nm, U = - 0.8, I = 0.17 nA)$ of the modal metastable structure. (b) Supposed model of the modal metastable structure.Reuse & Permissions

Physical Review B

covering condensed matter and materials physics

Understanding and controlling the weakly interacting interface in $perylene ∕ Ag (110)$

L. Gao, Z. T. Deng, W. Ji, X. Lin, Z. H. Cheng, X. B. He, D. X. Shi, and H.-J. Gao

Phys. Rev. B 73, 075424 – Published 16 February 2006

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Physical Review B

covering condensed matter and materials physics

Understanding and controlling the weakly interacting interface in perylene∕Ag(110)

L. Gao, Z. T. Deng, W. Ji, X. Lin, Z. H. Cheng, X. B. He, D. X. Shi, and H.-J. Gao

Phys. Rev. B 73, 075424 – Published 16 February 2006

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Understanding and controlling the weakly interacting interface in $perylene ∕ Ag (110)$