Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 7: Organic photovoltaics and electronics (joint session HL/CPP)

HL 7.5: Vortrag

Montag, 1. April 2019, 16:15–16:30, H31

Barrier Heights in Contacts to Electroluminescent Thin Films of 1-(pyridin-2-yl)-3-(quinolin-2-yl)imidazo[1,5-a]quinoline Determined by Kelvin Probe Force Microscopy — •Clemens Geis¹, Georg Albrecht¹, Julia Ruhl², Jasmin Martha Herr², Richard Göttlich², and Derck Schlettwein¹ — ¹Justus-Liebig-Universität Gießen, Institut für Angewandte Physik — ²Justus-Liebig-Universität Gießen, Institut für Organische Chemie

Thin films of 1-(pyridin-2-yl)-3-(quinolin-2-yl)imidazo[1,5-a]quinoline (PCIC) were prepared by physical vapor deposition and analyzed in situ by Kelvin probe force microscopy (KPFM). As contact phases, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and poly(9-vinylcarbazole) (PVK) were used as hole conductors and bathocuproine (BCP) as electron conductor. Charge carrier injection barriers were identified, electroluminescent layer structures were prepared and effects of contact formation on radiative recombination were studied. Aside from the expected blue emission, a significantly red-shifted emission was found and assigned to electroplex formation with BCP. Using PCIC in a host-guest system within a matrix of PVK led to blue emission at improved luminescence. The studied interactions of PCIC with typical contact materials reveal the potential and limitations of PCIC as an electroluminescent material.