Patent ID: 9041108
Filing Date: 2015-05-26
Classification: H01L

Abstract:
1. A semiconductor on insulator (SOI) substrate comprising: a bottom bulk semiconductor layer; a buried insulator layer on the bottom bulk semiconductor layer; an SOI layer on the buried insulator layer; a doped source that extends throughout a thickness of the SOI layer; a doped drain that extends throughout the thickness of the SOI layer; a channel film disposed between the doped source and the doped drain, with a top surface of the channel film disposed below a top surface of the doped source and the doped drain; and a remaining portion of the SOI layer under the channel film; wherein the channel film abuts the doped source and the doped drain at both side and bottom surfaces thereof to form a sharp channel-source junction and a sharp channel-drain junction; and wherein the remaining portion of the SOI layer under the channel film abuts the doped source and abuts the doped drain to form a diffuse SOI-source junction and a diffuse SOI-drain junction such that the diffuse junctions have a junction width of about twice that of the sharp junctions along a horizontal orientation of the SOI layer.