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We compare chemical vapor deposition (CVD) and physical vapor deposition (PVD) WSi2 metal gate process for In0.53Ga0.47As n-metal-oxide-semiconductor field-effect transistors using 10 and 6.5 nm Al2O3 as dielectric layer. The CVD-processed metal gate device with 6.5 nm Al2O3 shows enhanced transistor performance such as drive current, maximum transconductance and maximum effective mobility. These values are relatively better than the PVD-processed counterpart device with improvement of 51.8%, 46.4%, and 47.8%, respectively. The improvement for the performance of the CVD-processed metal gate device is due to the fluorine passivation at the oxide/semiconductor interface and a nondestructive deposition process.

applied physics letters

Comparison between chemical vapor deposited and physical vapor deposited WSi2 metal gate for InGaAs n-metal-oxide-semiconductor field-effect transistors