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• W2036672007 abstract "In this study, the reliability of several potential interconnect methods for high temperature applications are evaluated by using accelerated thermal cyclic tests on typical LED test carriers. The applied interconnect materials are SAC (Sn-Ag-Cu), SAC+(SAC with doping elements), and an eutectic AuSn solder alloy. The degradation behavior and typical failure modes in the different interconnect materials are analyzed at different test intervals. SAC+ shows better fatigue resistance than SAC based solder interconnects at the early phase of tests. However, the leading position decreases at relatively long test cycles and high stress situations. This could be explained by the different behavior of crack propagation in SAC and SAC+ interconnects caused by the changing microstructures under cyclic temperature loads. Although well processed AuSn shows relatively higher fatigue resistance to cyclic thermal loads than SAC/SAC+ based interconnects, some issues like cracks in the component or substrate, or the crack in the plating layers could be an attention point. In addition, the process need be taken carefully to avoid some quality issues like (micro-) cracks in the component. Three dimensional numerical models of typical LED modules are developed. The time and temperature dependent creep behavior of the interconnect material is considered. The developed models enable the analysis of the thermal — mechanical performance of solder interconnects under cyclic temperature loads. Furthermore, the sensitivity of fatigue resistance with respect to reliability parameters is predicted for several designs. It is concluded that the fatigue resistance is most sensitive for changes in thickness and meniscus of solder interconnects. Also it is shown that AuSn is less sensitive to meniscus changes than SAC/SAC+." @default.
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• W2036672007 date "2012-09-01" @default.
• W2036672007 modified "2023-09-26" @default.
• W2036672007 title "Potential interconnect technologies for high power LEDs assemblies" @default.
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• W2036672007 doi "https://doi.org/10.1109/estc.2012.6542061" @default.
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