Patent ID: 9362171
Filing Date: 2016-06-07
CPC Classification: H01L

Claim Text:
1. A method of forming a device comprising: providing a substrate, wherein the substrate comprises a buried oxide (BOX) layer sandwiched by a base substrate and a bottom substrate, wherein the BOX layer comprises first and second major surfaces, the first major surface contacts a bottom surface of the base substrate and the second major surface contacts a top surface of the bottom substrate; forming a dielectric layer on the base substrate; forming through via (TV) contacts within the substrate, wherein the TV contacts are formed in through via openings that extend from a top surface of the dielectric layer to within the BOX layer of the substrate and wherein the through via openings terminate within the BOX layer and at a distance away from the second major surface of the BOX layer which contacts the top surface of the bottom substrate; forming upper interconnect levels on the base substrate over a top surface of the TV contacts, wherein the dielectric layer separates the upper interconnect levels from the base substrate; providing a carrier substrate over a top surface of the upper interconnect levels; and removing the bottom substrate and a portion of the BOX layer, wherein removing the portion of the BOX layer exposes a bottom surface of the TV contacts, and wherein the remaining BOX layer serves as a first redistribution (RDL) dielectric layer of a lower RDL of the device.