Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Organic Electronics and Photovoltaics - Hybrid and Organic Layer Systems
CPP 13.3: Vortrag
Montag, 12. März 2018, 15:30–15:45, C 243
Energetics of polar organic metal-insulator-semiconductor diodes probed by different techniques — •Alexander Hofmann1, Simon Züfle2, Stéphane Altazin2, Kohei Shimizu3, Beat Ruhstaller2, Hisao Ishii3, and Wolfgang Brütting1 — 1Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Institute of Computational Physics, ZHAW, 8401 Winterthur, Switzerland — 3Center for Frontier Science, Chiba University, Chiba, 263-8522 Japan
The strong dipole moment of polar organic materials like tris-(8-hydroxyquinolate) aluminum (Alq3), if not oriented perfectly anisotropic, will lead to the buildup of a giant surface potential (GSP) of the organic film. As we have shown previously [1], it is possible to apply the CELIV (Charge Extraction by Linearly Increasing Voltage) method on polar diodes to determine the charge transport activation energy. Combined with impedance spectroscopy, this technique can be used to measure the injection barrier of the underlying metal-semiconductor interface [2]. In this contribution, we show the practical performance of this method compared to ultra violet photoelectron spectroscopy as an established method of determining injection barriers. We have applied the technique to the prototypical polar organic system N,N’-Di(1-naphthyl)-N,N’-diphenyl-(1,1’-biphenyl)-4,4’-diamine (NPB) and Alq3 in different dilutions and show the dependence of the determined barrier on the dilution ratio.
[1] Journal of Applied Physics 121, 175501 (2017) [2] Journal of Applied Physics 122, 115502 (2017)