Patent ID: 6858529

Claim:
A method of forming a semiconductor device, the method comprising: forming an insulating layer on a semiconductor substrate including a conductive region thereof, wherein the insulating layer has a contact hole therein exposing a portion of the conductive region; and forming a polysilicon contact plug in the contact hole wherein at least a portion of the polysilicon contact plug is doped with an element having a diffusion coeffient that is less than a diffusion coefficient of phosphorus (P) wherein forming the polysilicon contact plug comprises, forming a first portion of the polysilicon contact plug partially filling the contact hole while leaving an unfilled portion of the contact hole, wherein the first portion of the polysilicon contact plug is doped with the element having the diffusion coefficient that is less than the diffusion coefficient of phosphorus (P) wherein forming the first portion of the polysilicon contact plug comprises forming the first portion of the polysilicon contact plug using a single wafer type deposition apparatus, and after forming the first portion of the polysilicon contact plug, forming a second portion of the polysilicon contact plug in the unfilled portion of the contact hole wherein the second portion of the polysilicon contact plug is doped with an element different than the element used to dope the first portion of the polysilicon contact plug wherein forming the second portion of the polysilicon contact plug comprises forming the second portion of the polysilicon contact plug using a batch type deposition apparatus.