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O: Fachverband Oberflächenphysik

O 22: Organic-Inorganic Hybrid Systems and Organic Films

O 22.17: Poster

Monday, March 7, 2016, 18:15–20:30, Poster E

The OTFT Awakens - Live in-situ organic thin film transistor (OTFT) measurements during growth — •Nils Norrman, Sebastian Mäder, Julia Rittich, and Matthias Wuttig — I. Physikalisches Institut (IA), RWTH Aachen University

Organic semiconductors are of great interest for optoelectronic applications due to their high flexibility and efficiency. Indeed, first commercial products are already available like OLED displays and organic solar cells. The investigation of organic thin film transistors (OTFTs) provides a peerless opportunity for understanding the crucial properties influencing the electrical performance.

Here, we present live in situ measurements obtained during the growth of the very first layer of the organic-channel-material. The OTFTs were prepared using a bottom gate bottom contact geometry to enable electrical contacting during thermal evaporation of the organic material. Precisely controlling deposition rate and substrate temperature in a special vacuum setup allows to electrically characterize all critical properties right from the moment the first molecules arrive at the substrate.

These properties provide an excellent insight into the underlying effects governing efficiency in organic materials.