Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 54: Organic Electronics and Photovoltaics V (CPP jointly with DS, HL, O)

O 54.2: Vortrag

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

Multi-analytical investigation of SAM formation in printing relevant timescales III: OFET devices — •Milan Alt^{1, 2, 6}, Janusz Schinke^{2, 3}, Sabina Hillebrandt^{2, 5}, Marc Hänsel^{2, 4}, Kaja Deing^{2, 6}, Uli Lemmer^{1, 2}, and Norman Mechau^{1, 2} — ¹Karlsruher Institute of Technology — ²InnovationLab, Heidelberg — ³TU Braunschweig — ⁴TU Darmstadt — ⁵Uni Heidelberg — ⁶Merck KGaA

Self-assembled monolayers (SAMs) can be used to effectively reduce contact resistances originating from energetic misalignments at metal-semiconductor interfaces. Solution processing of SAMs has been intensively studied and is in principle compatible with high throughput printing techniques. However, most studies on SAMs feature immersion in very dilute solutions for many hours, in some cases up to several days. The objective of this work is to understand SAM accumulation with a focus on short time scales in order to estimate weather the deposition of well performing SAMs can be speeded up sufficiently to be compatible with typical film drying times in printing. We combined analytical characterization of SAM treated metal surfaces via photoelectron- and IR-spectroscopy, as well as Kelvin Probe with measurements of the actual injection barriers in OFET devices. We chose the widely used 1H,1H,2H,2H-Perfluorodecanethiol SAM and investigated its quality and charge injection performance in dependency of the process parameters immersion time and molecular concentration. Additionally, we studied the impact of ambient condition on SAM deposition and the resulting SAM performance, in order to account for a realistic fabrication environment.