Patent ID: 8669639
Filing Date: 2014-03-11
Classification: H01L

Abstract:
1. A semiconductor element, comprising: a substrate; a first well, disposed on the substrate; a second well, disposed on the substrate; a third well, disposed on the substrate and located between the first well and the second well; a fourth well, disposed on the substrate and connected to the first well; a bottom layer, disposed below the second well, wherein the first well, the bottom layer and the second well surround the third well for floating the third well and the substrate; a first heavily doping region, disposed in the first well; a second heavily doping region, disposed in the second well; a third heavily doping region, disposed in the third well; and a field plate, disposed above a junction between the first well and the fourth well; wherein each of the first well the second well, the bottom layer, the first heavily doping region and the second heavily doping region has a first type doping; each of the substrate, the third well, the fourth well, and the third heavily doping region has a second type doping; and the first type doping is complementary to the second type doping.