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HL: Fachverband Halbleiterphysik

HL 22: Organic Electronics and Photovoltaics II: Doping

HL 22.8: Vortrag

Montag, 20. März 2017, 17:15–17:30, ZEU 260

Effective work function reduction of practical electrodes using an organometallic dimer — Kouki Akaike¹, Marco V. Nardi¹, Martin Oehzelt^2,1, Johannes Frisch^2,1, •Andreas Opitz¹, Christos Christodoulou¹, Giovanni Ligorio¹, Paul Beyer¹, Melanie Timpel¹, Igor Pis³, Federica Bondino⁴, Karttikay Moudgil⁵, Stephen Barlow⁵, Seth R. Marder⁵, and Norbert Koch^1,2 — ¹Humboldt-Universität zu Berlin, Germany — ²Helmholtz-Zentrum Berlin, Germany — ³Elettra-Sincrotrone Trieste, Italy — ⁴IOM CNR Laboratorio TASC, Italy — ⁵Georgia Institute of Technology, USA

The control of the cathode work function (WF) is essential to enable efficient electron injection and extraction at organic semiconductor/cathode interfaces in organic electronic devices. Here, ultraviolet photoelectron spectroscopy is used to determine the work function reduction by moderately air-stable pentamethylrhodocene dimer onto various conducting electrodes, by either vacuum deposition or drop casting from solution, to less than 3.6 eV, with 2.7 eV being the lowest attainable value. Electron transfer from the molecule to the respective substrates is responsible for the appreciable WF reduction. Notably, even after air exposure, the WF of the donor-covered electrodes remains below those of typically used clean cathode metals, such as Al and Ag. This demonstrates the ability of the pentamethylrhodocene dimer to reduce the WF for a wide range of electrodes used in all-organic or organic-inorganic hybrid devices.

K. Akaike et al., Adv. Funct. Mater. 26 (2016) 2493-2502.