Open AccessImpact of interface-state formation on the charge-carrier dynamics at organic-metal interfaces
Author(s) -
Manuel Marks,
Nico Armbrust,
J. Güdde,
U. Höfer
Publication year - 2020
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/abb0c3
Subject(s) - monolayer , adsorption , physics , chemical physics , metal , scattering , electron , electron transfer , semiconductor , charge (physics) , atomic physics , electron scattering , resonance (particle physics) , perylene , molecular physics , crystallography , chemistry , materials science , nanotechnology , fluorescence , optics , optoelectronics , quantum mechanics , metallurgy
We study the role of electronic interface states on the electron transfer dynamics between layers of the organic semiconductor 3,4,9,10-perylene-tetracarboxylic acid dianhydride (PTCDA) and the (111) and (100) surfaces of silver. For this purpose, we investigate the change of the decay dynamics of the first ( n = 1) image-potential state on these surfaces upon adsorption of an ordered monolayer of PTCDA by means of time-resolved two-photon photoemission (2PPE). We find that the already short lifetime of the ( n = 1)-state on Ag(111) is only slightly further reduced by PTCDA adsorption, whereas a much stronger reduction by a factor of three is observed for adsorption on Ag(100) resulting in similar lifetimes for both orientations. We show by model calculations on the basis of an analytical one-dimensional pseudo-potential that the enhanced decay for PTCDA/Ag(100) can be attributed to the opening of an additional channel for electron-electron scattering by the formation of an interface state which is derived from the Shockley-type surface resonance of Ag(100).