Enhancing Low-Temperature and Pressureless Sintering of Micron Silver Paste Based on an Ether-Type Solvent
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Micron silver paste enables a low-temperature and pressureless sintering process by using an ether-type solvent CELTOL-IA (C x H y O z , x > 10, boiling point of approximately 200°C) for the die attachment of high-powered devices. The conductive patterns formed by the silver paste had a low electrical resistivity of 8.45 μΩ cm at 180°C. The paste also achieved a high bonding strength above 30 MPa at 180°C without the assistance of pressures. These superior performance indicators result from the favorable removal of the solvent, its thermal behavior, and its good wetting on the silver layer. The results suggest that the micron silver paste with a suitable␣solvent can promote the further spreading of next-generation power devices owing to its marked cost advantage and excellent performance.
KeywordsMicron silver paste electronic packaging low-temperature and pressureless sintering solvent wetting behaviors
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Thank Youji Suzuki and Yasuyuki Akai coming from Daicel Corporation in Japan for providing the solvents and discussing their usage in experimental. This work was partly supported by the COI Stream Project, and Grant-in-Aid for Scientific Research (Kaken S, 24226017). H. Zhang acknowledges the financial support from China Scholarship Council for his PhD research in Osaka University.
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