CoW metallization for high strength bonding to both sintered Ag joints and encapsulation resins

• Published in: Journal of materials science. Materials in electronics Vol. 30; no. 12; pp. 11151 - 11163
• Main Authors: Iwashige, Tomohito, Endo, Takeshi, Sugiura, Kazuhiko, Tsuruta, Kazuhiro, Sakuma, Yuichi, Kurosaka, Seigo, Oda, Yukinori, Chen, Chuantong, Nagao, Shijo, Suganuma, Katsuaki
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-06-2019; Springer Nature B.V
• Subjects: Adhesive joints; Adhesive strength; Bonded joints; Bonding strength; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cobalt; Compatibility; Electronics; Encapsulation; Gold; High temperature; Materials Science; Metallizing; Molding (process); Molding compounds; Nickel; Optical and Electronic Materials; Polymers; Reliability; Resins; Shear strength; Silver; Sintering; X ray photoelectron spectroscopy
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-019-01458-y

One of the applications of wide band gap semiconductors is high temperature operation. That application requires high temperature compatible (i) joining materials such as sinter Ag, (ii) encapsulation resins such as imide type primers or molding compounds, and (iii) metallization for those materials. Ag metallization, the best candidate metallization for sinter Ag materials, has difficulty in bonding to encapsulation resins. Conversely, Ni/Au-flash metallization enables strong resin adhesion but also demonstrates poor reliability for sintered Ag joints. There is no single metallization compatible to both sintered Ag and encapsulation resin for high temperature application. This paper reports on a single metallization, electroless plated CoW metallization, which has demonstrated the capability to achieve both (i) high-temperature reliability (250 °C for 500 h) for sintered Ag joints and (ii) high-temperature adhesion (at 225 °C) for encapsulation resins. Such results have not been achieved with either Ag or Au metallization. The shear strength of sintered Ag joints on CoW metallization exceeded 40 MPa. TEM observation revealed excellent bonding between the sintered Ag and the metal Co of the CoW metallization. Furthermore, CoW metallization also showed strong resin adhesion (about 21 MPa) at 225 °C. XPS analysis identified metal Co for bonding to sinter Ag and, Co(OH)
2
and WO
x
for bonding to resin on the top surface of CoW metallization layer. The foregoing results indicate that CoW may well represent a new metallization process for the fabrication of high reliability and high-temperature compatible SiC power modules.