Patent ID: 8846448
Filing Date: 2014-09-30
Classification: H01L,H05B

Abstract:
1. A tool arrangement for package-on-package thermal processing to limit warpage and void formation, comprising: a process chamber configured to surround a package-on-package structure and to isolate the package-on-package structure from an ambient environment surrounding the tool arrangement; a variable frequency microwave source configured to heat the package-on-package structure with microwave radiation at variable frequency, variable temperature, and variable duration; a pressure generator configured to generate an inert gas and deliver the inert gas to the process chamber simultaneous to irradiating the package-on-package structure with microwave radiation; a planarity measurement tool configured to determine warpage of a surface of the package-on-package structure; a void monitoring tool configured to monitor void formation within the package-on-package structure; and a controller configured to independently control operation of the pressure generator and the variable frequency microwave source based upon the determined warpage and monitored void formation, wherein the pressure generator and the variable frequency microwave source are configured to operate simultaneously to reduce warpage within the package-on-package structure, while minimizing void formation within an electrically-insulating adhesive which couples packages of the package-on-package structure.