Patent ID: 8697509
Filing Date: 2014-04-15
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device, said semiconductor device including an n-channel type first MISFET in a first region of a semiconductor substrate, a p-channel type second MISFET in an adjacent second region of the semiconductor substrate, and a silicon nitride film covering the first and second MISFETs and having a different tensile stress in the adjacent first and second regions, said manufacturing method comprising the steps of: (a) preparing the semiconductor substrate; (b) respectively forming the first MISFET in the first region of the semiconductor substrate, and the second MISFET in the second region of the semiconductor substrate; (c) after the step (b), forming a first insulating film serving as a tensile stress film and comprised of silicon nitride over the semiconductor substrate so as to cover the first and second MISFETs; (d) after the step (c), forming a mask layer covering the first insulating film in the first region and exposing the first insulating film in the second region; (e) after the step (d), performing plasma processing on the first insulating film in the second region; and (f) after the step (e), forming an interlayer insulating film over the first insulating film in the first and second region, wherein the step (c) comprises the steps of: (c1) forming a silicon nitride film; and (c2) after the step (c1), irradiating the silicon nitride film formed in the step (c1) with ultraviolet rays; wherein a cycle comprised of the step (c1) and the step (c2) is repeated one or more times to thereby form the first insulating film, and wherein in the step (e), the plasma processing relieves a tensile stress of the first insulating film in the second region.