Supercritical fluid (SCF) technology is employed at low temperature as a postgate dielectric treatment to improve gate SiO 2 /germanium (Ge) interface in a Ge-based metal-oxide-semiconductor (Ge-MOS) device. The SCF can transport the oxidant and penetrate the gate oxide layer for the oxidation of SiO 2 /Ge interface at 150 °C. A smooth interfacial GeO 2 layer between gate SiO 2 and Ge is thereby formed after SCF treatment, and the frequency dispersion of capacitance-voltage characteristics is also effectively alleviated. Furthermore, the electrical degradation of Ge-MOS after a postgate dielectric annealing at 450 °C can be restored to a extent similar to the initial state.
|Number of pages||3|
|Journal||Applied Physics Letters|
|State||Published - 26 Mar 2010|