InSb-TiOPc interfaces: Band alignment, ordering and structure dependent HOMO splitting
Författare
Summary, in English
Thin films of titanyl phthalocyanine (TiOPc) have been adsorbed on InSb(1 1 1) (3 x 3) and InSb(1 0 0) c(8 x 2) surfaces and studied with respect to their electronic structure using photoemission (PES), density functional theory (DFT) and scanning tunneling microscopy (STM). The interface chemical interaction is weak in both cases; no adsorbate induced surface band bending is observed and the energy level alignment across the interface is determined by the original position of the substrate Fermi level and the charge neutrality level of the molecule. Room temperature adsorption results in disordered films on both surfaces. The behaviors after annealing are different; on InSb(1 0 0) well-ordered molecular chains form along and on top of the In-rows, whereas on (1 1 1) no long range order is observed. The disorder leads to intermolecular interactions between the titanyl group and neighboring benzene rings leading to a split of TiOPc HOMO (highest occupied molecular orbital) by as much as 0.8 eV. (C) 2009 Elsevier B.V. All rights reserved.
Avdelning/ar
Publiceringsår
2009
Språk
Engelska
Sidor
3160-3169
Publikation/Tidskrift/Serie
Surface Science
Volym
603
Issue
20
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Natural Sciences
- Physical Sciences
Nyckelord
- Scanning tunneling microscopy
- Organic-inorganic semiconductor interface
- InSb
- Phthalocyanine
- Photoelectron spectroscopy
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0039-6028