06-11-2014 дата публикации
Номер: US20140327018A1
Принадлежит:
It is an object of the present invention to provide a power semiconductor device, which is capable of being operable regardless of thermal stress generation, reducing a heat generation from wire, securing the reliability of bonding portion when the device is used for dealing with a large amount current and/or under a high temperature atmosphere, a method of manufacturing the device and a bonding wire. In a power semiconductor device in which a metal electrode (die electrode ) on a power semiconductor die and another metal electrode (connection electrode ) are connected by metal wire using wedge bonding connection, the metal wire is Ag or Ag alloy wire of which diameter is greater than 50 μm and not greater than 2 mm and the die has thereon one or more metal and/or alloy layers, each of the layer(s) being 50 Å or more in thickness and a metal for the layer is selected from Ni, Cr, Cu, Pd, V, Ti, Pt, Zn, Ag, Au, W and Al. 2. A power semiconductor device according to claim 1 ,wherein the Ag or Ag alloy wire is covered by a wire coating layer of which thickness is 30 Å or more, the wire coating layer contains one or more metals, an alloy including the metal, or an oxide or nitride of the metal, and each of the metal(s) is one selected from the group consisting of Pd, Au, Zn, Pt, Ni and Sn.3. A power semiconductor device according to claim 1 ,wherein connection between the Ag or Ag alloy wire and the die electrode and/or the connection electrode is made by using ultrasonic waves while temperature of either the wire or the electrode is kept at 60° C. or more.4. A power semiconductor device according to claim 2 ,wherein the wire coating layer on the surface of the wire is formed by a wet coating, a dry coating or a nano-particle metal depositing after the wire and the electrode are bonded.5. A power semiconductor device according to claim 1 ,wherein the power semiconductor die uses a SiC semiconductor.6. A method of manufacturing a power semiconductor device according to ...
Подробнее