Patent ID: 11923239
Assignee: SOITEC
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A substrate for microelectronic radiofrequency devices, comprising:
a substrate comprising a semiconductor material;
trenches in an upper surface of a region of the substrate, at least some of the trenches comprising a first filler material located within the respective trench and a maximum lateral dimension of the trenches is 10 microns or less;
a dielectric layer located directly on the semiconductor material and the first filler material on the upper surface of the substrate along a lateral extent of the region of the substrate, wherein the dielectric layer comprises an oxide or a nitride material; and
a useful layer comprising a material selected from a group consisting of a semiconductor material, a conductive material, or a piezoelectric material located directly on the dielectric layer in locations above the trenches along the lateral extent of the region of the substrate, the material of the useful layer comprising a continuous portion in two lateral directions and located above each of the trenches.