Publication detail

Role of step edges on the structure formation of α-6T on Ag(441)

WAGNER, T. FRITZ, D. RUDOLFOVÁ, Z. ZEPPENFELD, P.

Original Title

Role of step edges on the structure formation of α-6T on Ag(441)

Type

journal article in Web of Science

Language

English

Original Abstract

Controlling the orientation of organic molecules on surfaces is important in order to tune the physical properties of the organic thin films and, thereby, increase the performance of organic thin film devices. Here, we present a scanning tunneling microscopy (STM) and photoelectron emission microscopy (PEEM) study of the deposition of the organic dye pigment α-sexithiophene (α-6T) on the vicinal Ag(441) surface. In the presence of the steps on the Ag(441) surface, the α -6T molecules exclusively align parallel to the step edges oriented along the [1View the MathML source0]-direction of the substrate. The STM results further reveal that the adsorption of the α-6T molecules is accompanied by various restructuring of the substrate surface: Initially, the molecules prefer the Ag(551) building blocks of the Ag(441) surface. The Ag(551) termination of the terraces is then changed to a predominately Ag(331) one upon completion of the first α-6T monolayer. When closing the two layer thick wetting layer, the original ratio of Ag(331) and Ag(551) building blocks ( ≈ 1:1) is recovered, but a phase separation into microfacets, which are composed either of Ag(331) or of Ag(551) building blocks, is found.

Keywords

α-sexithiophene; Ag(441); Vicinal surface; PEEM; STM; Growth

Authors

WAGNER, T.; FRITZ, D.; RUDOLFOVÁ, Z.; ZEPPENFELD, P.

Released

20. 9. 2017

Publisher

Elsevier

Location

https://doi.org/10.1016/j.susc.2017.09.008

ISBN

0039-6028

Periodical

Surface Science

Year of study

667

Number

1

State

Kingdom of the Netherlands

Pages from

17

Pages to

24

Pages count

8

URL

https://doi.org/10.1016/j.susc.2017.09.008

BibTex

@article{BUT140820,
  author="Thorsten {Wagner} and Daniel Roman {Fritz} and Zdena {Rudolfová} and Peter {Zeppenfeld}",
  title="Role of step edges on the structure formation of α-6T on Ag(441)",
  journal="Surface Science",
  year="2017",
  volume="667",
  number="1",
  pages="17--24",
  doi="10.1016/j.susc.2017.09.008",
  issn="0039-6028",
  url="https://doi.org/10.1016/j.susc.2017.09.008"
}