Patent ID: 7927999

Claim:
A method of manufacturing a semiconductor device, comprising: forming a horizontal first interconnect layer on a supporting substrate, said first interconnect layer including a first insulating layer and a first conductor interconnect in said first insulating layer, said first conductor interconnect extending in the horizontal direction; mounting a semiconductor chip on a first surface of said first interconnect layer; removing said supporting substrate after said mounting of said semiconductor chip; and forming a horizontal second interconnect layer on a second surface of said first interconnect layer opposite to said first surface, after said removing of said supporting substrate, said second interconnect layer including a second insulating layer and a second conductor interconnect in said second insulating layer, said second conductor interconnect extending in the horizontal direction, wherein said second insulating layer of said second interconnect layer includes a resin having a lower thermal decomposition temperature than a resin constituting said first insulating layer of said first interconnect layer, and wherein a horizontal length of said second conductor interconnect is longer than a vertical length thereof.