Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 22: Organic-Inorganic Hybrid Systems and Organic Films
O 22.9: Poster
Monday, March 7, 2016, 18:15–20:30, Poster E
Adjusting the Work Function of Solution Processed Nickel Oxide by Self-Assembled Monolayers — •Florian Friedrich1,2, Sebastian Hietzschold1,2,3, Patrick Reiser1,4, Eric Mankel1,4, Sabina Hillebrandt1,2, Robert Lovrincic1,3, and Wolfgang Kowalsky1,2,3 — 1InnovationLab, Heidelberg, Germany — 2KIP, Heidelberg University, Germany — 3IHF, TU Braunschweig, Germany — 4MAWI, TU Darmstadt, Germany
Solution processed nickel(II) oxide (NiO) is a promising hole selective anode material in organic devices. However, the work function of NiO is too low for many currently used organic materials [1]. The purpose of this work is to adjust the work function of solution processed NiO thin films via self-assembled monolayers (SAMs). A few nanometer thin NiO layers, formed by monoethanolamine with nickel acetate tetrahydrate in ethanol, were spin-coated on an indium tin oxide (ITO) surface and were thermally annealed in ambient atmosphere. The effective surface work function of this NiO layers were adjusted by chemisorption of phosphonates in terms of dipolar SAMs such as perfluorohexyloctyl phosphonic acid. Work function changes were examined by Kelvin probe measurements and photoelectron spectroscopy. The surface has been further characterized with atomic force microscopy, ellipsometry and goniometry. The results can be used to improve energy level alignment at interfaces in organic opto-electronic devices and increase their overall efficiency. References: [1] Schulz et al., NiOX/MoO3 Bi-Layers as Efficient Hole Extraction Contacts in Organic Solar Cells. Adv. Funct. Mater., 24: 701-706 (2014)