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Adsorption heights and bonding strength of organic molecules on a Pb-Ag surface alloy
DOI:
10.1103/PhysRevB.94.235436
Authors:
Benjamin
Stadtmueller
(University of Kaiserslautern; Graduate School of Excellence Materials Science in Mainz)
,
Norman
Haag
(University of Kaiserslautern)
,
Johannes
Seidel
(University of Kaiserslautern)
,
Gerben
Van Straaten
(Peter Grunberg Institut (PGI-3); Julich-Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology)
,
Markus
Franke
(Peter Grunberg Institut (PGI-3); Julich-Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology)
,
Christian
Kumpf
(Peter Grunberg Institut (PGI-3); Julich-Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology)
,
Mirko
Cinchetti
(Technische Universitat Dortmund)
,
Martin
Aeschlimann
(University of Kaiserslautern)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Physical Review B
, VOL 94
, PAGES 235436
State:
Published (Approved)
Published:
December 2016
Diamond Proposal Number(s):
10370
,
11915
Abstract: The understanding of the fundamental geometric and electronic properties of metal-organic hybrid interfaces is a key issue on the way to improving the performance of organic electronic and spintronic devices. Here, we studied the adsorption heights of copper-II-phthalocyanine (CuPc) and 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) on a Pb 1 Ag 2 surface alloy on Ag(111) using the normal-incidence x-ray standing waves technique. We find a significantly larger adsorption height of both molecules on the Pb-Ag surface alloy compared to the bare Ag(111) surface which is caused by the larger size of Pb. This increased adsorption height suppresses the partial chemical interaction of both molecules with Ag surface atoms. Instead, CuPc and PTCDA molecules bond only to the Pb atoms with different interaction strength ranging from a van der Waals–like interaction for CuPc to a weak chemical interaction with additional local bonds for PTCDA. The different adsorption heights for CuPc and PTCDA on Pb 1 Ag 2 are the result of local site-specific molecule-surface bonds mediated by functional molecular groups and the different charge donating and accepting character of CuPc and PTCDA.
Diamond Keywords: Alloys; Semiconductors
Subject Areas:
Materials,
Physics,
Chemistry
Instruments:
I09-Surface and Interface Structural Analysis
Added On:
11/04/2017 09:17
Discipline Tags:
Surfaces
Hard condensed matter - electronic properties
Physics
Physical Chemistry
Electronics
Chemistry
Materials Science
Metallurgy
Technical Tags:
Diffraction
Spectroscopy
X-ray Standing Wave (XSW)
X-ray Photoelectron Spectroscopy (XPS)
Hard X-ray Photoelectron Spectroscopy (HAXPES)