Dresden 2017 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 9: Poster Session

DF 9.17: Poster

Tuesday, March 21, 2017, 14:00–16:00, P1C

Implementing conductive domain walls in LiNbO₃ for optoelectronic applications in OLEDs — •Tillmann Stralka, Christian Godau, Alexander Haussmann, Thomas Kämpfe, and Lukas Eng — Institute of Applied Physics, Technische Universität Dresden, Germany

The research on ferroelectric domain walls (DWs) has focused for the last years on their unique property of electronic charge transport when being properly tuned. In fact, domain wall conductivity (DWC) was reported for both thin-film [1] and bulk-single-crystalline [2] ferroelectrics. In lithium niobate (LiNbO₃: LNO), DWC can be reversibly tuned through high-voltage treatment [3,4] or super-band-gap illumination [5], rendering this material ideal for the integration into optoelectronic devices. The present work reports on the development of such an optoelectronic device that combines conductive DWs with organic light emission diode (OLEDs). OLEDs are built in vertical stacks, with the charge-carrier mobility being optimized perpendicular to the stacks while becoming very restricted parallel to these layers [6] hence affecting the local light emission dramatically. Here, we implement conductive DWs as so-called local vias contacting the electron- and hole-transport layers in such an OLED.

[1] J. Seidel et al., Nature Mater. 8 (2009), 229. [2] T Sluka et al., Nature Comm. 4 (2013), 1808. [3] C. Godau et al., (2016), submitted. [4] T. Kämpfe et al., Phys. Rev. B 89 (2014), 035314. [5] M. Schröder et al., Adv. Func. Mater. 22 (2012), 3926. [6] Shu-Hao Wen et al., J. Phys. Chem. B 113 (2009), 8813.