Patent ID: 7466011

Claim:
An active silicon (Si) device cleaved from a silicon substrate, the active Si device comprising: a Si substrate with a post-cleaving plane surface including impurities of a first ion type, and a bottom surface; an active Si layer overlying the Si substrate bottom surface; a circuit formed in the Si active layer; gettering regions underlying the Si active layer, including a second ion type acting as a gettering agent for the first ion type; wherein the Si substrate is a Si-on-insulator (SOI) substrate with a buried oxide layer (BOX) between the Si substrate and the active Si layer; wherein the Si substrate post-cleaving plane surface includes: a first thickness surface in areas underlying the S/D regions; a second thickness surface, where the second thickness is less than the first thickness, in areas underlying the channel region; and vertical plane surfaces formed between the areas of first and second thickness surfaces; and wherein the gettering regions are formed between Si substrate first thickness surface and the S/D regions.