Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: P1: Interfaces and Thin Films

CPP 15.2: Poster

Monday, March 16, 2015, 16:00–19:00, Poster A

Investigations on ZnO scattering layers for OLED applications — •Lorenz Biessmann, Christoph J. Schaffer, Johannes Schlipf, Volker Körstgens, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85738 Garching

By now the internal quantum efficiency of organic light-emitting diodes (OLEDs) reached values close to 1 but the overall efficiency still suffers on the extraction of the photons from the device. For further improvements of the performance one can apply a scattering layer to the device. Besides the direct structuring of the substrate surface, the attachment of a transparent layer on the substrate is a very promising approach. With an optical band gap of 3.3 eV, ZnO is a suitable material for this method. In this work ZnO is used as an additional layer on a glass substrate to achieve scattering abilities. For this purpose a structure giving diblock copolymer template was combined with sol-gel chemistry for tailoring the ZnO scattering layer. This yields thin films with nano- and micro-structures. The film morphology as probed by scattering techniques and SEM is related to the spectral response to gain a structure-function relationship.