Patent ID: 9508614
Filing Date: 2016-11-29
CPC Classification: B23K,H01L

Claim Text:
1. A method for aligning a chip onto a substrate comprising: depositing a ferrofluid, the ferrofluid being a colloidal liquid made of magnetic nanoparticles suspended within a solvent and having a particular surface tension, onto a substrate having one or more pads that electrically couple to a semiconductor layer; placing a chip with one or more solder balls that electrically couple to logic elements of the chip onto the deposited ferrofluid; supporting the chip on the ferrofluid, in a substantially coplanar orientation to the substrate; determining that the one or more solder balls of the chip are misaligned from a desired location on the one or more pads of the substrate; and adjusting, in response to the determination that the one or more solder balls of the chip are misaligned from the desired location on the one or more pads of the substrate, a position of the ferrofluid within a three-dimensional space with a magnetic field until the one or more solder balls of the chip are aligned in the desired location on the one or more pads of the substrate.