Patent ID: 7985645

Claim:
A method for fabricating a semiconductor device, comprising: depositing a storage node oxide and a support film over a semiconductor substrate having a cell region and a peripheral region defined thereon; etching the support film and the storage node oxide to form a multiplicity of storage node holes in the cell region and a guard ring hole at the boundary of the peripheral region adjoined to the cell region; forming a multiplicity of cylindrical type lower electrodes within the storage node hole and at the same time forming a conductive layer within the guard ring hole; depositing a capping oxide that completely fills in the storage node hole and that partially fills in only a part of the guard ring hole; depositing a gapfill film for completely filling in a remaining part of the guard ring hole; separating the multiplicity of lower electrodes from the cell region; patterning the support film to remove the support film from within the cell region; and performing a wet dip-out process to remove the storage node oxide within the cell region to form a cylindrical type lower electrode.