Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 46: Organic Thin Films III

DS 46.6: Talk

Friday, March 26, 2010, 15:15–15:30, H8

template induced area selective growth: control over patterning of organic semiconductors — •Wenchong Wang, Dingyong Zhong, Chuan Du, Harald Fuchs, and Lifeng Chi — Physikalisches Institut and Center for Nanotechnology (CeNTech), Universität Münster, 48149 Münster, Germany

Functional small-molecular-weight organic molecules have received great scientific and technological interest due to their promising applications in electronics and optoelectronics. However, their future success in applications will strongly depend on the fabrication processes that include feasible methods for patterning. Here we present two strategies for area selective growth of organic molecules based on different mechanisms, namely binding-energy-difference-induced and step-edge-induced growth. Molecules may prefer to nucleate on material with which molecules have larger binding energy from other area when diffuse on pre-patterned substrate. Fully uniform nucleation control at the predefined locations can be achieved by an appropriate selection of the growth parameters and template dimensions. Molecules can also be controlled to nucleate at the edge of the template first, and grow laterally due to strong interaction such as π-π interaction of aromatic molecules, resulting in area selective growth of molecules on topographically low area of substrate. The technique can be used to grow crack-free, crystalline films with large domain sizes, presenting significantly increased charge mobility in comparison with un-patterned substrates. Further more, the two mechanisms can be combined together to separate molecules at defined locations.