The structure of copper phthalocyanine and perylene-3,4,9,10-tetracarboxylic dianhydride overlayers on the (111)A surfaces of InAs and InSb

Authors
Citation
Jj. Cox et Ts. Jones, The structure of copper phthalocyanine and perylene-3,4,9,10-tetracarboxylic dianhydride overlayers on the (111)A surfaces of InAs and InSb, SURF SCI, 457(3), 2000, pp. 311-318
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE SCIENCE
ISSN journal
0039-6028 → ACNP
Volume
457
Issue
3
Year of publication
2000
Pages
311 - 318
Database
ISI
SICI code
0039-6028(20000610)457:3<311:TSOCPA>2.0.ZU;2-Y
Abstract
Low energy electron diffraction has been used to investigate the ordered st ructures formed when copper phthalocyanine (CuPc) and perylene 3,4,9,10-tet racarboxylic dianhydride (PTCDA) are vapour deposited onto the unpassivated , In-terminated InAs(111)A-(2 x 2) and InSb(111)A-(2 x 2) reconstructed sur faces. A (root 12 x root 12)R30 degrees structure is observed on both surfa ces after 1-2 monolayers CuPc deposition and a commensurate? diamond-shaped lattice is formed with intermolecular spacing of 1.48 and 1.59 nm on InAs and InSb: respectively. The similarity between the structures, and the unus ually large intermolecular spacing, is thought to be related to the presenc e of exposed second layer group V atoms in the (2 x 2) reconstruction of th e substrate with which the CuPc molecules interact and by which they are pi nned. Deposition of PTCDA also leads to the formation of ordered overlayer structures on both surfaces. The diffraction patterns support the presence of six equivalent domains of a rectangular PTCDA lattice that has two molec ules per unit cell, the molecular arrangement based on a herringbone struct ure. The results are consistent with growth occurring with the bulk (102) p lane parallel to the substrate surface. (C) 2000 Elsevier Science B.V. All rights reserved.