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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Published in | Journal of electron spectroscopy and related phenomena Vol. 195; pp. 263 - 271 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.08.2014
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 0368-2048 1873-2526 |
DOI: | 10.1016/j.elspec.2014.02.009 |