Patent ID: 7790549

Claim:
A method for forming a semiconductor power device on a semiconductor substrate comprising: opening a plurality of deep trenches in the semiconductor substrate and implanting and diffusing a drain region of a conductivity type same as the semiconductor substrate below a bottom surface of said deep trenches in the semiconductor then growing an epitaxial layer of an opposite conductivity type from the conductivity type of said semiconductor substrate wherein said epitaxial layer fills said deep trenches and forming an overflow top epitaxial layer having a controlled thickness based on a width between said deep trenches and covers a top surface of said semiconductor substrate; and forming a plurality of trench MOSFET cells by opening and forming trench gates through said overflow top epitaxial layer and extending into areas of said semiconductor substrate between said deep trenches having width significantly greater than said deep trenches wherein forming said MOSFET cells further comprising forming body regions and source regions entirely in said overflow top surface above said deep trenches wherein a super-junction effect is achieved through charge balance between the epitaxial layer in the deep trenches and the semiconductor substrate directly adjacent to the deep trenches whereby a breakdown voltage of said MOSFET cells is controlled based on the controlled thickness of said overflow top layer.