Patent ID: 9613913
Date: 2017-04-04
CPC Classifications: H01L

Claim:
1. A method of forming an electromagnetic interference (EMI) shielding layer of a ball grid array (BGA) semiconductor package on external surfaces of the BGA semiconductor package to shield EMI, the method comprising: (a) providing a BGA semiconductor package having a lower surface, on which a plurality of solder balls are formed; (b) providing a base tape having an attaching portion that is thicker than a height of the solder balls and is formed of an elastic adhesive material, wherein ball holes that are concave are formed in the attaching portion of the base tape at positions respectively corresponding to the solder balls of the BGA semiconductor package; (c) forming a package-tape assembly by pressing the BGA semiconductor package against the base tape such that the plurality of solder balls of the BGA semiconductor package are sunk into the attaching portion of the base tape and the BGA semiconductor package is adhered to the base tape, wherein the package-tape assembly is formed by pressing the BGA semiconductor package against the attaching portion while the solder balls of the BGA semiconductor package are disposed to respectively face the ball holes of the attaching portion; (d) forming the EMI shielding layer on the BGA semiconductor package by sputtering a conductive layer on the package-tape assembly; and (e) removing the base tape from the package-tape assembly.