Patent ID: 6200865
Filing Date: 2001-03-13
Classification: H01L

Abstract:
A method for forming a semiconductor device, comprising:forming a dielectric sacrificial gate structure upon a semiconductor substrate;introducing first impurity distributions into the semiconductor substrate using the sacrificial gate structure as a mask, wherein the impurity distributions are of opposite type than the semiconductor substrate;forming dielectric spacers adjacent opposed sidewall surfaces of the sacrificial gate structure, wherein the dielectric spacers comprise a different chemical composition than the sacrificial gate structure;introducing second impurity distributions into the semiconductor substrate using the sacrificial gate structure and dielectric spacers as a mask, wherein the second impurity distributions are of the same type as the first impurity distributions, and wherein the second impurity distributions are more heavily doped and extend further into the substrate than the first impurity distributions;forming silicide regions upon the semiconductor substrate and exclusive of the dielectric spacersforming protective dielectrics above the semiconductor substrate to an elevation level commensurate with an upper surface of the sacrificial gate structure, wherein the protective dielectrics comprise a different chemical composition than the sacrificial gate structure;removing the sacrificial gate structure to form a trench;introducing dopants into a portion of the semiconductor substrate exposed by formation of the trench; andfilling at least a portion of the trench with a conductive material.