Patent ID: 8564058

Claim:
A super-junction trench MOSFET comprising a plurality of unit cells with each unit cell in an active area comprising: a substrate of a first conductivity type; an epitaxial layer of said first conductivity type grown on said substrate, said epitaxial layer having a lower doping concentration than said substrate; a pair of deep trenches starting from a top surface of said epitaxial layer and down extending into said epitaxial layer; a mesa between said pair of deep trenches; a first doped column region of the first conductivity type with column shape within each said mesa; a pair of second doped column regions of a second conductivity type with column shape adjacent to sidewalls of said pair of deep trenches within each said mesa, in parallel with and surrounding said first doped column region; a body region of the second conductivity type in each said mesa, covering a top surface of said first and second doped column regions, extending between said pair of deep trenches; at least one trenched gate starting from the top surface of said epitaxial layer and down penetrating through said body region and extending into said first doped column in each said mesa, each said trenched gate comprising a gate electrode padded by a gate oxide layer; multiple trenched source-body contacts with each filled with contact metal plug extending into said body region in each said mesa; and a source region of said first conductivity type surrounding an upper portion of each said trenched gate, extending between the upper portion of each said trenched gate and sidewalls of adjacent trenched source-body contacts.