Method of manufacturing fuse element used in memory device and fuse element
First Claim
1. A method of manufacturing a fuse element used in a memory device comprising:
- preparing a substrate on which a grounding layer is formed;
forming a fuse line on said grounding layer formed on said substrate;
forming a first interlayer insulating film including BPSG on said grounding layer so as to cover said fuse line;
planarizing the top surface of said first interlayer insulating film;
forming a polycrystalline silicon (polysilicon) film on said first interlayer insulating film planarized;
forming a second interlayer insulating film including BPSG on said polysilicon film;
planarizing the top surface of said second interlayer insulating film;
partially etching said second interlayer insulating film and an upper region of said polysilicon film to form a first opening portion above said fuse line, wherein said polysilicon film is exposed within said first opening portion;
forming a metal wiring layer on side and bottom walls of said first opening portion and on said second interlayer insulating film;
partially etching said metal wiring layer and said polysilicon film at the bottom portion of said first opening portion to form a second opening portion within said first opening portion and above said fuse line, wherein said first interlayer insulating film is exposed within said second opening portion;
forming an insulating film portion on at least inner walls of said first opening portion and said second opening portion; and
partially etching at the bottom portion of said second opening portion said insulating film portion and an upper region of said first interlayer insulating film to form a third opening portion within said second opening portion and above said fuse line, wherein said first interlayer insulating film is exposed in said third opening portion.
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0 Petitions
Accused Products
Abstract
A method of manufacturing a fuse element used in a semiconductor memory device by which P/W repair rate can be improved, and a fuse element produced by such method. The method comprises: forming a first interlayer insulating film including BPSG so as to cover the fuse line and planarizing the top surface; forming a polysilicon film on the first interlayer insulating film; forming a second interlayer insulating film including BPSG on the polysilicon film and planarizing the top surface; partially etching the second interlayer insulating film and an upper region of the polysilicon film to form a first opening portion above the fuse line; forming a wiring layer on inner walls of the first opening portion and on the second interlayer insulating film; partially etching the wiring layer and the polysilicon film at the bottom portion of the first opening portion to form a second opening portion above the fuse line and to expose the first interlayer insulating film; forming an insulating film on at least inner walls of the first second opening portions; and partially etching the insulating film at the bottom portion of the second opening portion and an upper region of the first interlayer insulating film to form a third opening portion above the fuse line.
9 Citations
11 Claims
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1. A method of manufacturing a fuse element used in a memory device comprising:
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preparing a substrate on which a grounding layer is formed;
forming a fuse line on said grounding layer formed on said substrate;
forming a first interlayer insulating film including BPSG on said grounding layer so as to cover said fuse line;
planarizing the top surface of said first interlayer insulating film;
forming a polycrystalline silicon (polysilicon) film on said first interlayer insulating film planarized;
forming a second interlayer insulating film including BPSG on said polysilicon film;
planarizing the top surface of said second interlayer insulating film;
partially etching said second interlayer insulating film and an upper region of said polysilicon film to form a first opening portion above said fuse line, wherein said polysilicon film is exposed within said first opening portion;
forming a metal wiring layer on side and bottom walls of said first opening portion and on said second interlayer insulating film;
partially etching said metal wiring layer and said polysilicon film at the bottom portion of said first opening portion to form a second opening portion within said first opening portion and above said fuse line, wherein said first interlayer insulating film is exposed within said second opening portion;
forming an insulating film portion on at least inner walls of said first opening portion and said second opening portion; and
partially etching at the bottom portion of said second opening portion said insulating film portion and an upper region of said first interlayer insulating film to form a third opening portion within said second opening portion and above said fuse line, wherein said first interlayer insulating film is exposed in said third opening portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification