Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 73: Organic electronics and photovoltaics IV (organized by CPP)

HL 73.3: Vortrag

Mittwoch, 2. April 2014, 15:30–15:45, ZEU 260

Multi-analytical investigation of SAM formation on printing- relevant time scales I: Kelvin probe and photoelectron spectroscopy — •Janusz Schinke^1,5, Marc Hänsel^2,5, Milan Alt^3,4,5, Sabina Hillebrandt^2,5, Eric Mankel^6,5, Wolfram Jaegermann^6,5, Wolfgang Kowalsky^1,5, and Robert Lovrincic^1,5 — ¹TUBS, Inst. f. Hochfrequenztechnik — ²Uni HD, Kirchhoff-Inst. für Physik — ³Karlsruher Inst. f. Technologie — ⁴Merck KGaA — ⁵InnovationLab GmbH, Heidelberg — ⁶TUD, Materials Science Inst.

In organic electronic devices, charge injection at the contacts is crucial for electrical performance. The devices require electrodes with a sufficiently low contact resistance at the metal-semiconductor interface to inject into or collect charge carriers from the transporting layer. A smart way to align the energetics at the interface is the use of self-assembled monolayers (SAMs). We have studied the properties of 1H,1H,2H,2H-Perfluorodecanethiol using photoelectron spectroscopy (XPS/UPS), infrared spectroscopy (IR), ambient Kelvin probe (KP), and contact angle (CA) measurements and the injection barriers were also measured in actual devices - organic field effect transistors. Using these methods we were able to obtain a very deep understanding of the whole SAM adsorption process, as well as the impact of immersion time, concentration and the influence of ambient conditions on the resulting monolayer and its performance. With this knowledge we estimate optimized parameters to speed up the treatment process, in contrast to most studies where long immersion times are used, to be compatible with typical times used in standard printing methods.