Formation of metal–organic interface states studied with 2PPE

Experimental and theoretical investigations on the formation mechanism of interface-specific electronic states at metal–organic interfaces are reviewed. Model systems discussed are thin films of 3,4,9,10-perylene-tetracarboxylic acid dianhydride (PTCDA) and 1,4,5,8-naphthalene-tetracarboxylic acid d...

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Bibliographic Details
Published inJournal of electron spectroscopy and related phenomena Vol. 195; pp. 263 - 271
Main Authors Marks, Manuel, Schöll, Achim, Höfer, Ulrich
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2014
Subjects
Charge transfer
Electron dynamics
Metal-Organic Interfaces
NTCDA
Organic thin films
PTCDA
Time-resolved 2-photon photoemission
PTCDA
Time-resolved 2-photon photoemission
NTCDA
Organic thin films
Charge transfer
Electron dynamics
Metal-Organic Interfaces
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Summary:Experimental and theoretical investigations on the formation mechanism of interface-specific electronic states at metal–organic interfaces are reviewed. Model systems discussed are thin films of 3,4,9,10-perylene-tetracarboxylic acid dianhydride (PTCDA) and 1,4,5,8-naphthalene-tetracarboxylic acid dianhydride (NTCDA) on the silver single crystal surfaces Ag(111) and Ag(100). Time and angle-resolved two-photon photoemission (2PPE) reveals the occurrence of unoccupied electronic states that have no counterpart in the bulk metal or the organic overlayer. The interface states resemble Shockley-surface states of clean metals. They are strongly dispersive and show an ultra-short lifetime in the range of tens to hundred femtoseconds. The energy position of the interface states is to a large extent determined by the adsorption height of the molecules and their local surface density while the wave function experiences a strong influence from the adsorption geometry of the molecules.
ISSN:0368-2048
1873-2526
DOI:10.1016/j.elspec.2014.02.009