Method for manufacturing a semiconductor device comprising a guard ring between a cell region and a peripheral region
A semiconductor device including a cell region and a peripheral region, the semiconductor device comprising: a guard ring region provided between the cell region and the peripheral region, the guard ring region having a barrier structure.
1. A method for manufacturing a semiconductor memory device, the method comprising:
providing a substrate having a cell region, a peripheral region, and a guard ring region provided between the cell region and the peripheral region;
etching a second active region in the guard ring region to form a recess in the substrate;
filling a conductive material into the recess; and
depositing an insulating film within the recess over the conductive material to form a barrier gate in the second active region of the guard ring region,
wherein the barrier gate has a guard ring structure surrounding the cell region, and
wherein the cell region has a first active region and a first device isolation structure, the peripheral region has a second device isolation structure, and the guard ring region has the second active region between the first device isolation structure and the second device isolation structure.
2. The method according to claim 1 , wherein the conductive material includes any selected from the group consisting of tungsten, a titanium nitride film and a combination thereof.
3. The method according to claim 1 , wherein the insulating film includes a nitride film,
wherein the insulating film is deposited over the peripheral region and the guard ring region while the insulating film is being deposited within the recess, and
wherein the method further comprises:
removing a portion of the insulating film overlying the peripheral region with a mask that exposes only the peripheral region.
4. The method according to claim 1 , wherein the barrier gate is formed when a cell gate in the cell region is formed.
5. The method according to claim 1 , wherein the guard ring region encloses perimeters of the cell region.
6. The method according to claim 1 , wherein the substrate in the cell region is etched to form a recess in the cell region when the substrate in the guard ring region is etched, and
wherein the recess in the cell region is filled with the conductive material to form a cell gate when the recess in the guard ring region is filled with the conductive material to form the barrier gate.