Patent ID: 7936011

Claim:
A semiconductor power device comprising a plurality of power transistor cells surrounded by a trench opened in a semiconductor substrate wherein: at least one of said cells constituting an active cell having a source region disposed next to a trenched gate electrically connecting to a gate pad and surrounding said cell wherein said trenched gate further having a bottom shielding electrode filled with a gate material disposed below and insulated from said trenched gate; and at least one of said cells constituting a source contacting cell surrounded by said trench with a portion functioning as a source connecting trench filled with said gate material for electrically connecting between said bottom shielding electrode and a source metal disposed directly on top of said source connecting trench wherein said source connecting trench is formed at a location where two trenches intersect; an insulation protective layer disposed on top of said semiconductor power device having a gate opening provided for electrically connecting said gate pad to said trenched gate; said gate opening is disposed directly above a gate runner trench in a termination area of said semiconductor power device; said gate runner trench is wider and deeper than said trench provided for forming said trenched gate therein; wherein said runner trench further includes a shield gate trench structure with said bottom shielding electrode; wherein said bottom shielding electrode filled with said gate material having stepwise tapered profiled toward a bottom of said trench with a lining layer surrounded said gate material having a correspondingly stepwise increased thickness.