Patent ID: 6992355

Claim:
A semiconductor construction, comprising: a substrate comprising a silicon-containing layer over an insulative mass, the insulative mass comprising silicon dioxide; the substrate comprising an interface between the silicon-containing layer and the insulative mass; the insulative mass having a thickness; a band of material within the insulative mass, the material being selected from the group consisting of fluorine, bromine, chlorine, iodine, and mixtures thereof; a transistor gate proximate the silicon-containing layer, the transistor gate defining a channel region within the silicon-containing layer; a pair of source/drain regions within the silicon-containing layer and separated from one another by the channel region; wherein the band of material extends beneath the transistor gate and the pair of source/drain regions; and wherein a peak concentration of the band of material is within an upper half of the thickness of the insulative mass and is at least about 100 Angstroms beneath said interface.