Patent ID: 7262466

Claim:
A semiconductor-on-insulator structure comprising: first and second layers which are attached to one another either directly or through one or more intermediate layers, wherein the first layer comprises a substantially single crystal semiconductor material; the second layer comprises a glass or a glass-ceramic, having: (i) first and second substantially parallel faces separated by a distance D2, the first face being closer to the first layer than the second face; (ii) a reference surface which 1) is within the second layer, 2) is substantially parallel to the first face, and 3) is separated from that face by a distance D 2/2; (iii) positive ions of one or more types, each type of positive ion having a reference concentration Ci/Ref at the reference surface; and (iv) a region (a positive ion depletion region) which begins at the first face and extends toward the reference surface in which the concentration of at least one type of positive ion is depleted relative to the reference concentration Ci/Ref for that ion; and the CTE(25-300° C.) of the glass or glass-ceramic is less positive than the CTE(25° C.) of the semiconductor material.