Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 30: Organic electronics and photovoltaics I (DS, jointly with CPP, HL, O)
HL 30.5: Vortrag
Montag, 11. März 2013, 18:15–18:30, H32
The operational mechanism of ionic transition metal complex-based light-emitting electrochemical cells — •Sebastian B. Meier1,2, Stephan van Reenen3, Henk J. Bolink4, Martijn Kemerink3, Wiebke Sarfert2, and Albrecht Winnacker1 — 1Department of Materials Science VI: Materials for Electronics and Energy Technology, University of Erlangen-Nuremberg, Germany — 2Siemens AG, Corporate Technology, CT RTC MAT MPV-DE, Erlangen, Germany — 3Department of Applied Physics, Eindhoven University of Technology, The Netherlands — 4Instituto de Ciencia Molecular, Universidad de Valencia, Spain
Light-emitting electrochemical cells (LECs) are promising candidates for cost-efficient next generation solid-state lighting and signage applications. They feature only a single, solution-processible active layer comprising a luminescent material in an ionic environment which allows for charge carrier injection from air-stable electrodes and low operating voltages. The operational mechanism of LECs has been the subject of an intense debate ever since their discovery. Evidence for electrochemical doping has been demonstrated for polymer-based devices, whereas LECs comprising ionic transition metal complexes (iTMCs) have almost exclusively been stated to operate via an electrodynamic mechanism. We used fluorescence as well as scanning Kelvin probe microscopy on planar iTMC-LECs to elucidate their mechanism of work. Our results illustrate profound evidence for electrochemical doping in these kind of LEC devices and highlight that the position of the established p-i-n junction is not fixed but migrates during device operation.