Both gate and field oxides generally are grown by a thermal oxidation process because only thermal oxidation can provide the highest-quality oxides having the lowest. interface trap densities.

Using new type of thermal insulation materials, reasonable applying condensation trap. setting up a special vapor pipe for living and so on can improve the situation.

The trap is commonly used for floats, thermal-power, free-float, double-metal-style, pulse, and so on-bell-shaped float.