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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Supramolecular Aggregates

CPP 1.2: Talk

Monday, March 26, 2007, 10:00–10:15, H37

Controlled Fabrication of Molecular Nano-Dot Patterns — •Stephan Rath, Dirk Sauer, and Helmut Port — 3. Physikalisches Institut, Universität Stuttgart

For applications in molecular electronics and photonics small dot-like structures are attractive objects as they can be individually addressed.

To fabricate nano-dots thin organic films are deposited at UHV conditions on helium-cooled substrates. Controlled annealing to room temperature transforms the films into homogeneous distributions of isolated dots by dewetting. This process can be quantified and optimized for different combinations of molecules and substrates.

To achieve regular and closely packed patterns of dots, we introduced topographically structured substrates as templates. In this way, we are able to control size, density and arrangement of nano-dots on mm^2-sized areas. For characterization and single dot access two operation modes are applied: confocal microscopy in combination with AFM and scanning near-field optical microscopy (SNOM).