Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)
HL 61.15: Poster
Mittwoch, 18. März 2015, 15:00–20:00, Poster F
Charge Transfer Absorption and Emission at ZnO/Organic Interfaces — •Fortunato Piersimoni1, Raphael Schlesinger2, Johannes Benduhn3, Donato Spoltore3, Sina Reiter1, Ilja Lange1, Norbert Koch2, Koen Vandewal3, and Dieter Neher1 — 1Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany — 2Institut für Physik & IRIS, Adlershof Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 6, 12489 Berlin, Germany — 3Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Straße 1, 01069 Dresden, Germany
Here we investigate Hybrid Charge Transfer States (HCTS) at the planar interface based upon α-NPD and ZnO by means of spectrally resolved electroluminescence (EL) and external quantum efficiency (EQE) measurements. The appearance of a sub-gap signal in the EL and in the EQE spectra proves respectively the radiative decay and the absorption from direct excitation of HCTSs. By means of various phosphonic acid based self-assembled monolayers we tune the ZnO work function and the energy gap (Egap) between the ZnO conduction band and a-NPD LUMO level. We observe a correlation between Egap, the peak position of the NIR EL spectra and the open circuit voltage of photovoltaic devices, comprising these organic-inorganic interfaces. This unambiguously attributes the origin of the NIR emission to radiative recombination between an electron on the ZnO and a hole on α-NPD and confirms the relation between open circuit voltage and the energy of the charge-state, also for hybrid organic-inorganic interfaces.