Patent ID: 8981480
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a buried well having impurity ions of a first conductivity type, wherein the buried well is disposed on a substrate; a first active region and a second active region each having impurity ions of a second conductivity type, wherein the second conductivity type is different from the first conductivity type, and the first and second active regions are disposed on the buried well; an isolation layer disposed between and contacting the first and second active regions; and a low resistance region disposed between the isolation layer and the substrate and contacting the first and second active regions and the buried well, wherein the low resistance region has impurity ions of the second conductivity type, and a concentration of the impurity ions in the low resistance region is greater than a concentration of the impurity ions in each of the first and second active regions, wherein the first and second active regions are separated from each other by the isolation layer and the low resistance region.