Patent ID: 11955368
Assignee: IMEC VZW
Field: Semiconductors (Electrical engineering)
Classification: CPC B  H | IPC H

Claim 9:
10. The method according to claim 9, wherein the protrusions are pyramid-shaped and wherein at the end of the plasma etch procedure, one or more nano-sized tip portions are present on the apex area of the protrusions and no tip portions are present on the side planes of the protrusions, through one or a combination of the following:
a higher concentration of masking particles deposited on the apex area than on the side planes, during the plasma etch procedure,
the protrusions comprising a core and on the core a layer of the indentation material, the thickness of the layer higher on the apex area than one the side planes, so that at the end of the plasma etch procedure, the indentation material is removed from the side planes.