Patent ID: 6537854
Filing Date: 2003-03-25
Classification: H01L

Abstract:
A method for bonding an IC chip having corrugated multi-layered bumps to a substrate comprising the steps of:providing an IC chip having an active surface equipped with multi-layered bumps, said multi-layered bumps comprising a base layer formed of a compliant material and a cover layer formed of a conductive metal, said cover layer being in electrical communication with input/output pads onto which said bumps are built, said multi-layered bumps being formed in a corrugated shape with outwardly protruding tips, providing a substrate having a top surface equipped with conductive elements positioned corresponds to said bumps on said IC chip, positioning a solid sheet of an electrically insulative material between said conductive elements and said bumps, and compressing and heating said IC chip and said substrate together with said bumps contacting said conductive elements through said electrically insulative material until electrical communication between said outwardly protruding tips on said bumps and said conductive elements is established.