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Manufacturable Process/Tool for high-?/metal gate (Paperback)
Loot Price: R2,083
Discovery Miles 20 830
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Manufacturable Process/Tool for high-?/metal gate (Paperback)
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Off state leakage current related power dominates the CMOS heat
dissipation problem of state of the art silicon integrated
circuits. In this study, this issue has been addressed in terms of
a low-cost single wafer processing (SWP) technique using a single
tool for the fabrication of high- dielectric gate stacks for sub-45
nm CMOS. A system for monolayer photoassisted deposition was
modified to deposit high-quality HfO2 films with in-situ clean,
in-situ oxide film deposition, and in-situ anneal capability. The
system was automated with Labview 8.2 for gas/precursor delivery,
substrate temperature and UV lamp. The gold-hafnium oxide-aluminum
(Au-HfO2-Al) stacks processed in this system had superior quality
oxide characteristics with gate leakage current density on the
order of 1 x 10-12 A/cm2 @ 1V and maximum capacitance on the order
of 75 nF for EOT=0.39 nm. Achieving low leakage current density
along with high capacitance demonstrated the excellent performance
of the process developed. Detailed study of the deposition
characteristics such as linearity, saturation behavior, film
thickness and temperature dependence was performed for tight
control on process parameters. Using Box-Behnken design of
experiments, process optimization was performed for an optimal
recipe for HfO2 films. UV treatment with in-situ processing of
metal/high- dielectric stacks was studied to provide reduced
variation in gate leakage current and capacitance. High-resolution
transmission electron microscopy (TEM) was performed to calculate
the equivalent oxide thickness (EOT) and dielectric constant of the
films. Overall, this study shows that the in-situ fabrication of
MIS gate stacks allows for lower processingcosts, high throughput,
and superior device performance.
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