US Patent 7042081 Semiconductor device having heat dissipation layer

A semiconductor device includes a semiconductor constructing body which has a semiconductor substrate, a plurality of external connection electrodes formed on the semiconductor substrate, and heat dissipation columnar electrodes. Upper interconnections are mounted on one side of the semiconductor constructing body and connected to the external connection electrodes of the semiconductor constructing body. A heat dissipation layer is mounted on one side of the semiconductor constructing body and made of the same material as that of the upper interconnections.