Patent ID: 9520291
Filing Date: 2016-12-13
CPC Classification: H01L

Claim Text:
1. A method of providing an implanted region in a semiconductor structure including a first region and a second region, the method comprising: providing a first implantation mask covering the first region of the semiconductor structure, the first implantation mask including a first sacrificial layer, wherein the first sacrificial layer is formed as a spin-on-carbon layer, and a second sacrificial layer, wherein the second sacrificial layer is formed as a spin-on-glass layer; subjecting the semiconductor structure to an ion implantation process, wherein an extension of the first implantation mask is such that ion implantation in the first region is counteracted and ion implantation in the second region is allowed where the second region is implanted; forming a third sacrificial layer covering the second region of the semiconductor structure, wherein the third sacrificial layer includes carbon; removing the second sacrificial layer at the first region by etching, wherein the third sacrificial layer protects the second region from being affected by the etching, and removing the first sacrificial layer at the first region and the third sacrificial layer at the second region by etching.