Patent ID: 6103616
Filing Date: 2000-08-15
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, the method comprising:forming a first layer of interlayer dielectric on a surface of a semiconductor substrate that contains active semiconductor devices;forming a first etch stop layer on a surface of the first layer of interlayer dielectic;forming a second layer of interlayer dielectric on a surface of the first etch stop layer;forming a second etch stop layer on a surface of the second layer of interlayer dielectric;forming a first layer of photoresist on a surface of the second etch stop layer;etching the first layer of photoresist down to the surface of the second etch stop layer with an etch pattern having dimensions of a trench structure that will be formed in the second layer of interlayer dielectric wherein a portion of the second layer of interlayer dielectric is exposed having dimensions of the trench structure;removing the first layer of photoresist;forming a second layer of photoresist on the surface of the second etch stop layer and the exposed portion of the second layer of interlayer dielectric;etching the second layer of photoresist down to the surface of the second layer of interlayer dielectric with an etch pattern having dimensions of a via structure to be formed in the first layer of interlayer dielectric;etching the second layer of interlayer dielectric down to the surface of the first etch stop layer exposing a region of the first etch stop layer having dimensions of the via structure to be formed in the first layer interlayer dielectric;etching the exposed portions of the first etch stop layer;removing the second layer of photoresist exposing portions of the second layer of interlayer dielectric; andetching the exposed portions of the second layer of interlayer dielectric and the first layer of interlayer dielectric down to the surface of the semiconductor substrate exposing a region of the semiconductor substrate having dimensions of the via structure to be formed.