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O: Fachverband Oberflächenphysik

O 22: Organic-Inorganic Hybrid Systems and Organic Films

O 22.16: Poster

Montag, 7. März 2016, 18:15–20:30, Poster E

Impact of a MoO₃ front contact buffer layer on the electric and interface properties in organic bilayer solar cells — •Patrick Reiser^1,4, Michael Scherer^2,4, Sabina Hillebrandt^3,4, Robert Lovrincic^2,4, Wolfgang Kowalsky^2,4, Sebastian Beck^3,4, Annemarie Pucci^3,4, Eric Mankel^1,4, and Wolfram Jaegermann^1,4 — ¹Institute of Materials Science, Technische Universität Darmstadt — ²Institut für Hochfrequenztechnik, Technische Universität Braunschweig — ³Kirchhoff-Institut für Physik, Universität Heidelberg — ⁴InnovationLab GmbH, Heidelberg

In this study we correlate the chemical and electronic interface properties at different front contacts of conventional F₄ZnPc:C₆₀ bilayer solar cells with their electric characteristics. Starting from device and Scanning Kelvin Probe Microscopy data, we examine the interface of ITO/MoO₃/F₄ZnPc and ITO/F₄ZnPc using Photoelectron Spectroscopy on subsequently deposited layers of F₄ZnPc. As oxide substrates we used O₂-plasma cleaned ITO on glass and the same ITO coated with a 10nm thick intermediate MoO₃ buffer layer which shows a significant higher work function than bare ITO. There is a moderate impact of the buffer layer on the electronic band alignment difference of about 100meV. However, we observe chemical interactions of the F₄ZnPc with the ITO substrate. In-situ IR spectroscopy measurements were performed to study the F₄ZnPc adsorption mechanisms on differently treated oxide surfaces. Finally, the analytical measurements could successfully be correlated with the electric characteristics of the solar cell device.