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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.23: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Two photon photo-emission study of doped and undoped Pentacene thin films on Cu(111) — •Martin Laux, Indranil Sarkar, Andreas Ruffing, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern
Organic-metal interfaces plays a very important role in the performance of opto-electronic devices based on organic semiconductors, as the interface strongly affects the carrier injection in these devices. So, it is of utmost importance to understand the energy level alignment and corresponding energetics at organo-metallic interfaces [1]. Among various organic semiconductors, Pentacene (C22H14) forms a very important organic compound for organic devices due its intrinsically high carrier mobility and controllable electronic properties by doping [2]. Here we report, one-photon photoemission (1PPE) and two-photon photoemission (2PPE) measurements on pentacene thin films on Cu(111). Our results show presence of highly dispersive HOMO band, with effective mass of 0.35 me. For very low thickness of pentacene an unoccupied interface state appears. We also present time resolved 2PPE measurements on Cs doped pentacene thin films. Our results, indicate strong Cs induced modification of surface, bringing out the possibility of tuning the organic metal interface state using dopants.
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