BONDED STRUCTURE

摘要

A bonded structure 106 includes a semiconductor element 102 bonded to a Cu electrode 103 with a bonding material 104 predominantly composed of Bi, wherein the semiconductor element 102 and the Cu electrode 103 are bonded to each other via a laminated body 209a that progressively increases a Young's modulus from the bonding material 104 to a bonded material (the semiconductor element 102 and the Cu electrode 103), achieving stress relaxation against a thermal stress generated in a temperature cycle during the use of a power semiconductor module.