Semiconductor device, power converter device using it, and hybrid vehicle using the power converter device

A semiconductor device comprising:

• a semiconductor element having main current input/output electrodes with one and a remaining one thereof being take up to a one surface and a remaining surface of said semiconductor element respectively for causing one of said input/output electrodes to be contacted with a conductive layer of an insulating substrate to thereby support said semiconductor element at said insulating substrate;
• a conductive strip comprised of a composite material of either carbon and aluminum or carbon and copper adapted to be used for connection between the remaining input/output electrode of said semiconductor element and the conductive layer of said insulating substrate;
• and
• first and second contact layers each comprised of a solid solution of a mixture of two or more kinds of metal particles wherein each kind of metal particle is in nanometer order size and micron order size as selected from materials of gold, silver, nickel, copper, aluminum, zinc, tin, indium, bismuth, antimony, wherein
• a surface of said first contact layer is fixedly contacted to said conductive strip and another surface of said first contact layer is fixedly contacted to the remaining input/output electrode of said semiconductor element, and wherein
• a surface of said second contact layer is fixedly contacted to said conductive strip and another surface of said second contact layer is fixedly contacted to the conductive layer of said insulating substrate.