Patent ID: 9748186
Date: 2017-08-29
CPC Classifications: H01L

Claim:
1. A semiconductor device that is formed by electrically connecting an electrode of a semiconductor element and a wire using wire bonding, comprising: a metal film that has a higher hardness than the wire and is provided on a surface of the electrode, wherein the wire is bonded to the metal film by the wire bonding to provide a bonding interface, the bonding interface of the wire with the metal film has a recrystallization temperature that is higher than 175° C., and the semiconductor element has a bonding temperature that is less than the recrystallization temperature of the bonding interface, and wherein the bonding interface of the wire has a crystal grain size that is only equal to or less than 15 μm, and a portion which is away from the bonding interface of the wire includes a crystal grain with a grain size greater than 15 μm.