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Lead-free Nanosilver Die-attach Material for Making High-temperature Double-side Cooled Power Modules
Keywords: Nanosilver, Die-attach, Power Modules
One way to reduce the cost of future electric vehicles is to eliminate an extra cooling loop by developing reliable high-temperature power inverter modules that can be cooled directly from the radiator coolant. This demands power packaging technologies that can enable power semiconductor devices working at junction temperature in excess of 175C. In our research effort, we have focused on replacing solders for die-attaching power chips by an emerging low-temperature joining technology (LTJT) that relies on low-temperature sintering of silver powders. To reduce the process complexity of the conventional LTJT arising from the need of high pressure (about 40 MPa or 400 Kg-force per cm2), we developed a nanosilver die-attach material that can be processed below 270C under a few MPa pressure. The nanosilver-enabled LTJT is less likely to damage the chips and allows us to implement a planar packaging scheme for interconnecting both sides of power devices. The planar power modules have low parasitic inductances thus less ringing noises from the device-switching action and can be cooled from both sides of the devices for improved thermal management. Details on design and processing of the double-side cooled power modules and test results on their electrical and thermal performance will be presented.
G-Q. Lu,
Virginia Tech
Blacksburg, VA

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