Abstract
A simple and effective method to create solder bumps by using a droplet microgripper for electronic packaging is described. A reusable droplet microgripper was realised simply by patterning a Teflon amorphous fluoropolymer on a glass substrate to make a 5×5 hydrophilic opening site array of 300 µm-diameter circles and 600 µm pitches. The microgripper was used to self-arrange solder balls of 300 µm diameter on its wetted sites. After transferring the solder balls to a flux-coated soldering substrate by an alignment process, solder bumps were successfully created on the corresponding solder ball lands through a reflow process.
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