Patent ID: 9450048
Filing Date: 2016-09-20
CPC Classification: H01L

Claim Text:
1. A semiconductor device, comprising: a substrate having a first type conductivity; a deep well formed in the substrate and having a second type conductivity opposite to the first type conductivity; a first well formed in the deep well, wherein the first well has at least one of the first type conductivity and the second type conductivity; a first doped electrode region formed in the first well and having the first type conductivity; a second doped electrode region having the second type conductivity, wherein the second doped electrode region is formed in the first well and adjacent to the first doped electrode region; a field layer formed in the first well and having the first type conductivity, wherein the field layer extends down from the surface of the substrate and covers a top surface of the first doped electrode region; and at least one high voltage threshold voltage channel region formed in the first well and having the second type conductivity, wherein the high voltage threshold voltage channel region extends down from a surface of the substrate, a part of the second doped electrode region is covered by the high voltage threshold voltage channel region and another part of the second doped electrode region is covered by the field layer, a surface of the high voltage threshold voltage channel region has a first side, a second side opposite to the first side, a third side and a fourth side opposite to the third side, and the first side and the second side are adjoined to the third side and the fourth side.