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Design of Test Structures for the Characterization of Thermal–Mechanical Stress in 3D-Stacked IC

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12 Author(s)

In this paper, we present test structures and measurement techniques that enable the extraction of the significance of the thermal-mechanical stress in 3D-stacked integrated circuit technology. Heaters and integrated diodes have been used to determine the impact of hotspots in 3-D systems. The results obtained showed that in 3-D case, the peak temperature of a hotspot is three times higher compared to a traditional 2-D system. For the characterization of through silicon vias (TSVs)-induced stress and its impact on analog metal-oxide semiconductor (MOS) devices, a 10-bit current steering digital-to-analog converter (DAC) test structure is utilized. The DAC has been optimized to detect ion changes down to 0.5% due to TSV proximity, TSV orientation, thermal hotspots, and wafer thinning or stacking process. The results obtained from stand-alone short-channel MOS devices and the DAC structure clearly indicate the impact of TSV proximity and TSV orientation on the carrier mobility of nearby transistors.

Published in:

Semiconductor Manufacturing, IEEE Transactions on  (Volume:25 ,  Issue: 3 )

Date of Publication:

Aug. 2012

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