Method of forming a packaged semiconductor device
View Patent ↗A method is used to form a packaged semiconductor device. A semiconductor device, which has an active surface, is placed in an opening of a circuit board. The circuit board has a first major surface and a second major surface having the opening, first vias that extend between the first major surface and the second major surface, first contact pads terminating the vias at the first major surface, and second contact pads terminating the vias at the second major surface. A dielectric layer is applied over the semiconductor device and the second major surface of the circuit board. An interconnect layer is formed over the dielectric layer. The interconnect layer has second vias electrically connected to the second contact pads, third vias that are electrically connected to the active surface of the semiconductor device, an exposed surface, and third contact pads at the exposed surface.
1. A method of forming a packaged semiconductor device, comprising:
providing a circuit board having a first major surface and a second major surface and an opening in the second major surface, first vias that extend between the first major surface and the second major surface, first contact pads terminating the vias at the first major surface, and second contact pads terminating the vias at the second major surface;
attaching the circuit board to a carrier with a double-sided adhesive;
placing a semiconductor device in the opening of the circuit board, wherein the semiconductor device has an active surface that is generally coplanar with the second major surface of the circuit board and wherein the active surface includes device contact pads;
applying a photo-imageable dielectric layer over the active surface and sides of the semiconductor device and the second major surface of the circuit board;
patterning the photo-imageable dielectric layer via selective exposure to expose the second contact pads of the circuit board and the semiconductor device contact pads;
forming an interconnect layer over the photo-imageable dielectric layer, wherein the interconnect layer has second vias electrically connected to the second contact pads, third vias that are electrically connected to the contact pads on the active surface of the semiconductor device, an exposed surface, and third contact pads at the exposed surface; electrically connected to the second contact pads and the device contact pads
forming a plurality of solder balls on the third contact pads connecting the packaged semiconductor device through all of the third contacts pads to a single substrate;
removing the carrier from the circuit board; and
attaching another packaged semiconductor device to the first contact pads at the first major surface.
2. The method of claim 1 , wherein the circuit board is further characterized by having a solder mask layer on the first major surface, wherein the solder mask layer has openings at locations of the first contact pads.
3. The method of claim 2 , further comprising attaching the another packaged semiconductor device by connecting contacts of the another packaged semiconductor device to the first contact pads through the openings at the locations of the first contact pads.
4. The method of claim 3 , wherein the semiconductor device has a major surface opposite to the active surface.
5. The method of claim 1 , wherein the step of forming the interconnect layer comprises forming conductive layers at a plurality of levels from the second major surface of the circuit board.