Patent ID: 8361829
Filing Date: 2013-01-29
Classification: H01L

Abstract:
1. A method for forming a semiconductor device, the method comprising: forming an implant mask on a substrate, such that a first portion of the substrate is located under the implant mask, and a second portion of the substrate is exposed wherein the substrate comprises a silicon-on-insulator (SOI) substrate, comprising a top silicon layer, a buried oxide BOX layer located under the top silicon layer, and a bulk silicon layer located under the BOX layer, and wherein the implant mask is formed on the top silicon layer in the first portion of the substrate; performing oxygen ion implantation of the substrate; removing a portion of the implant mask to form a patterned implant mask after performing oxygen ion implantation of the substrate, wherein the patterned implant mask is located on a first portion of the first portion of the substrate, and exposes a second portion of the first portion of the substrate; performing a second oxygen ion implantation of the substrate after formation of the patterned implant mask, wherein the second oxygen ion implantation forms hole traps in the BOX layer in the second portion of the first portion of the substrate, and wherein the number of hole traps per unit of area in the BOX layer in the second portion of the first portion of the substrate is less than a number of hole traps per unit of area in the BOX layer in the second portion of the substrate; removing the implant mask and the patterned implant mask; and forming a first field effect transistor (FET) on the first portion of the substrate, and forming a second FET on the second portion of the substrate, wherein the second FET has a higher radiation sensitivity than the first FET.