Patent ID: 6150223
Filing Date: 2000-11-21
Classification: H01L

Abstract:
A method for forming a semiconductor device, said method comprising:providing a semiconductor substrate, wherein there is a gate oxide layer formed on said semiconductor substrate;sequentially forming a polysilicon layer, a conductive layer, and a first dielectric layer on said gate oxide layer;patterning to etch said first dielectric layer, said conductive layer, said polysilicon layer, and said gate oxide layer to form an interior gate and a peripheral gate;sequentially forming a second dielectric layer, a third dielectric layer, and a fourth dielectric layer over said interior gate and peripheral gate;forming a first photoresist layer on said fourth dielectric layer of interior circuit;etching said fourth dielectric layer of peripheral gate to form a second spacer of peripheral gate;etching said third dielectric layer of peripheral gate to form a first spacer of peripheral gate;removing said first photoresist layer and said fourth dielectric layer of interior circuit;forming a fifth dielectric layer on said third dielectric layer of interior circuit;removing said fourth dielectric layer and top surface of second dielectric layer of peripheral circuit;forming a fifth dielectric layer on said first dielectric layer and said third dielectric of peripheral circuit;forming a second photoresist layer on said fifth dielectric layer, wherein said second photoresist layer has a pattern of as a bit-line contact via of interior circuit and bit-line contact vias of peripheral circuit;anisotropically etching said second photoresist layer and fifth dielectric layer of interior circuit, wherein at least two spacers and a bit-line to substrate contact via is formed between two gates of interior circuit; andanisotropically etching said second photoresist layer and fifth dielectric layer of peripheral circuit, wherein a bit-line to gate contact via is formed on upper portion of said conductive layer of peripheral circuit and a bit-line to substrate contact via.