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Self-alignment of microchips by means of the surface tension of liquids

Sponsor:
Qimonda Dresden GmbH & Co. KG
Bundesministerium für Bildung und Forschung (BMBF)


Contact persons:

Dr. Karina Grundke
Dr. Astrid Drechsler
Dr. Alla Synytska

Duration:
2006-2007

Goal of this study was to show the feasibility of a self-alignment of microchips by means of liquid droplets. Model evaluations using Surface Evolver gave the behaviour of the droplets under alignment conditions and the influence of various parameters. Methods to create hydrophilic/hydrophobic structures on silicon surfaces were developed and tested. Thus, a selective wetting by the alignment medium was achieved.

modelling of liquid droplets during the alignment process
hydrophilic/hydrophobic structured surface with condensed water droplets (diameter 20 µm)
alignment setup

Microprinted self-assembled monolayers of suitable compounds yielded contact angle differences of more than 120°. With surfaces structured in this way, first alignment experiments were performed. They show that a self-alignment with liquid droplets is possible.

 
Self-alignment of microchips by means of the surface tension of liquids
Selbstjustage von Mikrochips mit Hilfe der Oberflächenspannung von Flüssigkeiten

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Polymer Interfaces

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Completed Projects