Patent ID: 8530998

Claim:
A semiconductor on insulator structure, comprising: a glass substrate; and a single crystal semiconductor layer bonded through electrolysis to the glass substrate, wherein a composition of the glass substrate is such that a liquidus viscosity thereof is about 100,000 Poise or greater; wherein the glass composition, when calculated in mole percent, and calculated from a batch on an oxide basis, is as follows: 64-72% SiO 2 , 9-16.5% Al 2 O 3 , 0-5% B 2 O 3 , 0.5-7.5% MgO, 1-10% CaO, 0-4.5% SrO, 0-7% BaO, and 0-9% (La 2 O 3 +Y 2 O 3 +RE 2 O 3 ); and wherein RE is a rare earth element, and a sum of MgO, CaO, SrO, BaO, and 3La 2 O 3 divided by Al 2 O 3 in mole percentages is greater than or equal to about 1.10.