Abstract

This study was devoted to investigate the effects of the contact angle and the bump arrangement on the underfill flow. The Hele-Shaw flow model, that considered the flow resistance in both the thickness direction between the chip and substrate and the plane direction between solder bumps, was assumed. A modified capillary force model including the effects of the contact angle and the bump arrangement was proposed. The capillary force was formulated based on either quadrilateral or hexagonal bump arrangements. A hexagonal arrangement of solder bumps was studied

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