Patent ID: 6020259
Filing Date: 2000-02-01
Classification: H01L

Abstract:
A method of forming an electrical contact on a semiconductor wafer, said method comprising:forming an isolation layer on said wafer;forming a contact hole in said isolation layer, said contact hole exposing a portion of said wafer;selectively forming a TiSi.sub.2 layer in said contact hole on said exposed wafer by using chemical vapor deposition and by controlling a deposition temperature, the reaction material being TiCl.sub.4, wherein said reaction material (TiCl.sub.4) reacts with said exposed wafer thereby forming said TiSi.sub.2 wherein said TiSi.sub.2 layer is selectively formed at said deposition temperature in the range of about 600.degree. C. to 700.degree. C.;forming a TiN layer on said isolation layer, on the surface of said contact hole and on the TiSi.sub.2 layer by using chemical vapor deposition in nitrogen ambient environment, the reaction material being TiCl.sub.4 ;forming a tungsten layer on said TiN layer and in said contact hole; andplanarizing said tungsten layer and said TiN layer to the surface of said isolation layer by using chemical mechanical polishing.