Patent ID: 8440541
Filing Date: 2013-05-14
Classification: H01L

Abstract:
1. A process for producing a silicon on insulator structure, the structure comprising a handle wafer, a silicon layer, and a dielectric layer between the handle wafer and the silicon layer, the structure having a central axis, a front surface and a back surface that are generally perpendicular to the central axis, a circumferential edge joining the front and back surfaces and a radius extending from the central axis to the circumferential edge, the process comprising: forming a dielectric layer on a front surface of at least one of a donor wafer and a handle wafer; bonding the dielectric layer to at least one of the donor wafer and the handle wafer to form a bonded wafer, wherein at least one of the donor wafer and the handle wafer has a thickness roll-off amount (ROA) of less than about −600 nm, wherein the thickness ROA is defined by the following measurement protocol that is based on a thickness profile of the donor wafer or handle wafer: separating the bonded wafer along a separation plane within the donor wafer such that the silicon layer remains bonded to the dielectric layer to form the silicon on insulator structure.