Patent ID: 9318571
Filing Date: 2016-04-19
CPC Classification: H01L

Claim Text:
1. A gate structure, comprising: a gate disposed on a substrate; a first spacer disposed on said substrate, surrounding said gate and being in an L shape; a second spacer disposed on said first spacer and surrounding said gate and having an arc outer sidewall, said second spacer being lower than half of said first spacer, wherein said arc outer sidewall has two ends contacting a horizontal part and a vertical part of said L shape of said first spacer respectively, an outer sidewall of a bottom of said first spacer and said arc outer sidewall of a bottom of said second spacer align with each other, and a top of said first spacer and a top of said second spacer have discontinuous change; and a stress film disposed on said gate, wherein said stress film directly contacts to said substrate, said two ends of said arc outer sidewall, and said vertical part of said L shape of said first spacer.