Patent ID: 8377756

Claim:
A method comprising: forming a well within a first material layer, the well having a generally U-shape in an XY cross-sectional plane, the first material layer doped a first conductivity type, the well doped a second conductivity type and an intermediate region between upright legs of the U-shaped well doped a first conductivity type; forming first and second sources within the intermediate region, the first and second sources spaced apart in an X direction and doped the first conductivity type; forming body regions within the intermediate region, the body regions between the first and second sources and doped a second conductivity type; forming source rungs within the intermediate region; wherein forming the first and second sources, forming the body regions and forming the source rungs each comprise employing a self-aligning technique further comprising masking the first and second sources, masking rung regions connecting the first and second sources and counterdoping exposed regions to a second conductivity type; wherein a body region is disposed between two consecutive source rungs, each source rung extending in the X direction and the source rungs spaced-apart in the Z direction, each source rung connecting the first and second sources at different locations along the first and second sources; and determining a ratio of a source rung area and a body region area to control a contact resistance between of the source rungs and the body regions.