Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 64: Organic-Inorganic Hybride Interfaces (joint session CPP/DS/HL, organized by DS)

CPP 64.7: Talk

Friday, March 24, 2017, 11:15–11:30, CHE 91

Analytical study of Solution-processed Nickel Oxide and its Application in Organic Electronics: (2) Infrared Spectroscopy — •Valentina Rohnacher^1,2, Sabina Hillebrandt^1,2, Florian Ullrich^2,3, Jakob Bombsch^2,4, Sebastian Beck^1,2, and Annemarie Pucci^1,2 — ¹Kirchhoff-Institut für Physik, Universität Heidelberg — ²InnovationLab, Heidelberg — ³TU Darmstadt — ⁴TU Braunschweig

The performance of organic photovoltaic cells (OPVs) is significantly influenced by the properties of the interfaces between the layers. Increasing the interfacial compatibility especially between the transparent conductive oxide electrode and the organic semiconductor layer can improve the charge carrier transport through the stack and thus the efficiency of the device. Thin films of nickel oxide (NiO) have shown promising characteristics as hole extraction layers in OPVs. In our studies, solution-processed NiO surfaces were passivated by self-assembled monolayers (SAMs) to tune the work function and to reduce the surface reactivity. Infrared spectroscopy gives insight into the composition of the investigated material and can monitor orientation of characteristic vibrations or functional groups. The results show that temperature and plasma treatment dramatically change the surface properties and that especially nickel hydroxide and nickel oxyhydroxide play an important role for the binding mechanism of SAMs. Together with photoelectron spectroscopy and OPV device characteristics a better understanding of the energetic and chemical properties at the interface was achieved helping to improve device performance.