Patent ID: 6913979

Claim:
A method of forming a metal oxide semiconductor transistor comprising: forming a gate electrode on a substrate, the gate electrode including a gate insulation pattern and a conductive pattern; forming a re-oxidation film on the gate electrode and on the substrate for curing the gate electrode and the substrate; forming a passivation layer on the gate electrode and on the substrate; forming a mask pattern for masking a portion of the substrate on which the passivation layer is formed, the unmasked portion forming an exposed portion of the substrate; forming a source and drain region by implanting impurity ions into the exposed portion of the substrate; cleaning the substrate to at least partially remove the passivation layer and substantially completely removing the mask pattern; forming a silicon oxide film on the sidewall of the gate electrode after removing the passivation layer; and forming a nitride spacer on the sidewall of the gate electrode on which the silicon oxide film is formed, the nitride spacer acting as a mask for implanting impurities into exposed portions of the substrate.