Patent ID: 11881397
Assignee: INFINEON TECHNOLOGIES AG
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A wafer composite, comprising:
a base portion;
a porous structure comprising:
a coarse-porous layered portion formed on the base portion;
a first fine-porous columnar portion formed on a first portion of the coarse-porous layered portion;
a non-porous portion formed on a second portion of the coarse-porous layered portion; and
a second fine-porous columnar portion formed on a third portion of the coarse-porous layered portion, wherein the non-porous portion is between the first fine-porous columnar portion and the second fine-porous columnar portion; and

an epitaxial layer formed directly on the first fine-porous columnar portion, the non-porous portion and the second fine-porous columnar portion.