Patent ID: 6872653
Filing Date: 2005-03-29
Classification: H01L,Y10T

Abstract:
1. A method of manufacturing a semiconductor device including a plurality of MISFETS each having a gate electrode, a source region and a drain region, comprising the steps of: (a) providing a semiconductor substrate; (b) forming the plurality of MISFETS on the semiconductor substrate; (c) forming an interlayer insulating film over the plurality of MISFETS; (d) forming openings in the insulating film to expose each of the source regions; (e) forming barrier metals in each of the openings; (f) forming a first aluminum-based conductor film over the barrier metals in each of the openings by a sputtering method; (g) heating the semiconductor substrate to a temperature over 400° C. to reflow the first aluminum-based conductor film to bury each of the openings partially; (h) forming a second aluminum-based conductor film on the first aluminum-based conductor film by a heat sputtering method; and (i) patterning the first and second aluminum-based conductor films to form a source electrode and a gate wiring, wherein: a drain electrode is formed on a back surface of the semiconductor substrate; the source electrode is formed continuously over each of the source regions and electrically connected with each of the source regions of the plurality of MISFETS; in the step (h), a heating temperature of the semiconductor substrate is set between 400° C. and 550° C.; in the step (h), the second aluminum-based conductor film is deposited while heating the semiconductor substrate from a back side of the semiconductor substrate; and in the step (h), the second aluminum-based conductor film flows and runs into the openings.