Influence of lithospheric mantle stratification on craton extension: Insight from two-dimensional thermo-mechanical modeling

2014 ◽  
Vol 631 ◽  
pp. 50-64 ◽  
Author(s):  
Jie Liao ◽  
Taras Gerya
Keyword(s):  
Lithospheric Mantle ◽  
Two Dimensional ◽  
Mechanical Modeling

Far Back End of Line Aluminum Stress Reduction Methods for Two-Dimensional/2.5D Fine Pitch Assemblies

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Krishna Tunga ◽  
Thomas Wassick ◽  
Maryse Cournoyer
Keyword(s):  
Experimental Data ◽  
Stress Reduction ◽  
Passivation Layer ◽  
Primary Concern ◽  
Two Dimensional ◽  
Mechanical Modeling ◽  
Aluminum Stress ◽  
Safe Level ◽  
Fine Pitch ◽  
Design Changes

Fine pitch interconnects when used with two-dimensional (2D)/2.5D packaging technology offer enormous potential toward decreasing signal latency and by making it possible to package increased electrical functionality within a given area. However, fine pitch interconnects present their own set of challenges not seen in packages with coarse pitch interconnects. Increased level of stresses within the far back end of line (FBEOL) layers of the chip is the primary concern. Seven different types of 2D and 2.5D test vehicles with fine pitch and coarse pitch interconnects were built and tested for mechanical integrity by subjecting them to accelerated thermal cycling between −55 °C and 125 °C. Finite element based mechanical modeling was done to determine the stress level within the FBEOL layers of these test vehicles. For all the tested assemblies, experimental data and modeling results showed a strong correlation between reduced pitch and increased level of stresses and increased incidence of failures within the FBEOL region. These failures were observed exclusively at the passivation layer and aluminum pad interface. Experimental data in conjunction with mechanical modeling were used to determine a safe level of stress at the aluminum to passivation layer interface. Global and local design changes were explored to determine their effect on the stresses at this interface. Several guidelines have been provided to reduce these stresses for a 2D/2.5D package assembly with fine pitch interconnects. Finally, a reliable low stress configuration, which takes into account all the design changes, has been proposed, which is expected to be robust with very low risk of failure within the FBEOL region.

scholarly journals Two-dimensional quantum mechanical modeling of nanotransistors

2002 ◽  
Vol 91 (4) ◽  
pp. 2343-2354 ◽  
Author(s):  
A. Svizhenko ◽  
M. P. Anantram ◽  
T. R. Govindan ◽  
B. Biegel ◽  
R. Venugopal
Keyword(s):  
Quantum Mechanical ◽  
Two Dimensional ◽  
Mechanical Modeling
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