Patent ID: 7217595

Claim:
A method, comprising: sealing a device, the device comprising: a substrate with a top surface; a first integrated circuit die above the substrate and spaced apart from the substrate by a first distance to form a first volume between the substrate and the first integrated circuit die, the first integrated circuit die having a bottom surface closer to the substrate and a top surface further from the substrate and a plurality of microelectronic devices; a first plurality of connectors extending from the top surface of the substrate to the bottom surface of the first integrated circuit die and forming an electrical connection between the substrate and the bottom surface of the first integrated circuit; a second integrated circuit die above the first integrated circuit die and spaced apart from the first integrated circuit die by a second distance to form a second volume between the first integrated circuit die and the second integrated circuit die, the second integrated circuit die having a bottom surface closer to the first integrated circuit die and a top surface further from the first integrated circuit die and a plurality of microelectronic devices; a second plurality of connectors extending from the top surface of the first integrated circuit die to the bottom surface of the second integrated circuit die; wherein sealing the device comprises substantially sealing the second volume between the first and second integrated circuit dies from a surrounding environment by applying a layer of underfill material extending from the substrate to the second integrated circuit die, the second volume between the first integrated circuit die and the second integrated circuit die and the second volume around the second plurality of connectors being substantially free of the underfill material after sealing the device.