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- W2107139097 abstract "Emission microscopes have over a decade of continuous usage in inspection of semiconductors from the front surface for emission sites. The development of multilevel metallization, flip chip and lead-on-chip (LOC) package design has eliminated or restricted this inspection avenue. Inspection from the backside of semiconductors is complicated by a silicon filter effect, in both short and long wavelengths, that is tied to the dopant concentration. Based on experience with customer devices of all types and the transmissivity calculation from published optical absorption data, we show that die thinning is a requirement for backside EM analysis. We describe a thinning and polishing technique that enables one to locally thin only the defective die, so that the mechanical integrity of the wafer is preserved to handle probing. We also explore the mechanics of deflection and stress in wafers due to probe needle load in backside wafer-level microprobing, where the wafer is supported only at the edge. We review the development of backside wafer-level microprobing and present the state-of-the-art of this technology. A close examination of the maximum allowable probe needle force leads us to the development of ultra-low-force (ULF) probe cards. We believe that the combination of our local die thinning and polishing technology, ULF probe cards, and fourth-generation emission microscopes, built upon backside wafer microprobers, provides IC failure analysts with a powerful new set of tools in years to come." @default.
- W2107139097 created "2016-06-24" @default.
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- W2107139097 date "1998-01-01" @default.
- W2107139097 modified "2023-09-25" @default.
- W2107139097 title "Dynamics of backside wafer level microprobing" @default.
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- W2107139097 doi "https://doi.org/10.1109/relphy.1998.670465" @default.
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