Patent ID: 6573566
Filing Date: 2003-06-03
Classification: H01L

Abstract:
A silicon-on-insulator (SOI) silicon controlled rectifier device (SCR) structure, comprising:a substrate; an insulation layer above the substrate; a plurality of isolation structures above the insulation layer such that a device region is defined between the isolation structures; a first-type well region and a second-type well region, wherein the first-type well region and the second-type well region are connected and formed in the device region; a first gate structure above the first-type well; a second gate structure above the second-type well; a first second-type doped region inside the first-type well; a first first-type doped region inside the first-type well formed between the first second-type doped region and the isolation structure adjacent to the first second-type doped region, wherein the first second-type doped region and the first first-type doped region are electrically connected to form a cathode of the SOI-SCR device; a second first-type doped region formed inside the first-type well between the first second-type doped region and the first gate structure adjacent to the first second-type doped region; a third first-type doped region formed within the first and the second-type well around a junction of the first and second-type wells between the first and the second gate structure; a second second-type doped region formed within the second-type well; and a fourth first-type doped region formed within the second-type well between the second second-type doped region and the second gate structure adjacent to the second second-type doped region, wherein the second second-type doped region and the fourth first-type doped region are electrically connected to form an anode of the SOI-SCR device.