Dresden 2017 – wissenschaftliches Programm
CPP 13.31: Poster
Montag, 20. März 2017, 18:30–21:00, P1A
Charge transfer emission at metal oxide/organic hybrid interfaces — •Stefan Zeiske1, Fortunato Piersimoni1, Ulrich Hörmann1, Lukas Hoffmann2, Thomas Riedl2, and Dieter Neher1 — 1Universität Potsdam, Potsdam, Germany — 2Bergische Universität Wuppertal, Wuppertal, Germany
It is well known that for organic solar cells the donor/acceptor charge transfer state correlates with the open-circuit voltage Voc and determines inter alia the efficiency of the organic device. Here, we investigate the interfacial hybrid charge transfer state at the planar interface between two metal oxides (SnO and ZnO) and organic small molecules. Spectrally resolved electroluminescence was utilized to extract information on the emission properties of the hybrid charge transfer state. The hybrid energy gap at the interface was tuned by using different inorganic metal oxides in combination with organic molecules of different HOMO level. Gaussian decomposition of the measured ZnO/organic spectra shows the presence of two separate contributions, in which a stationary contribution of a peak at around 1.23 eV is present. The spectral position of this feature is independent of the organic, electric field and light exposure, therefore this feature is tentatively attributed to the ZnO. The energy of the second peak correlates, by trend, with the expected HOMO level and depends on the applied electric field and light exposure. This emission is hence attributed to hybrid charge transfer states.