Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations
CPP 50.26: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P3
Investigations on Band Structure Engineering in Organic Semiconductors — •Katrin Ortstein1, Martin Schwarze1, and Karl Leo1,2 — 1Dresden Integrated Center for Applied Physics and Photonic Materials, TU Dresden, Germany — 2Fellow of the Canadian Institute for Advanced Research, Toronto (ON), Canada
In modern electronics, it is essential to create almost arbitrary band structures by adjusting the energy bands and the band gap. Until now, a possibility of band structure engineering in organic semiconductors has not been possible, since they usually exhibit localized electronic states instead of energy bands. In a recent publication [1], we showed that it is possible to continuously shift the ionization energy of organic semiconductors over a wide range by mixing them with halogenated derivatives. This tuning mechanism is based on long-range interactions of excess charges with the mean quadrupole field in the thin film.
In this work, we further investigate this phenomenon using ultraviolet photoelectron spectroscopy measurements and set the focus on the range of these charge-quadrupole interactions. For this purpose, we study blended layers composed of C60, ZnPc and F8ZnPc and additionally probe stepwise the electronic levels at their flat interfaces.
[1] Schwarze et al., Science 352, 1446 (2016)