Patent ID: 11944998
Assignee: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Micro-structural and nano-technology (Chemistry)
Classification: CPC B | IPC B

Claim 4:
5. The method of claim 4, the forming of the first region, the second region, and the third region on the semiconductor substrate comprises:
forming a second mask layer that exposes the first region and the third region and covers the second region;
implanting the impurity ions into the first region and the third region at the first average concentration by using the second mask layer as an ion implantation protection layer;
forming a third mask layer that exposes the third region and covers the first region and the second region; and
implanting the impurity ions into the third region by using the third mask layer as an ion implantation protection layer such that an ion implantation concentration of the third region becomes the third average concentration.