Patent ID: 7633119
Filing Date: 2009-12-15
Classification: H01L

Abstract:
1. A semiconductor power device comprising: a plurality of intersecting trenches formed in a semiconductor substrate wherein at least two intersecting trenches of said plurality of intersecting trenches are surrounded by a body region formed in said semiconductor substrate; wherein said body region further encompassing a source region disposed immediately next said at least two intersecting trenches thus constituting active semiconductor power cells; wherein said at least two intersecting trenches further comprising bottom shielded gate trench (SGT) structures filling with a conductive material; and said bottom SGT structures are covered by insulation layers; wherein said insulation layers shielding said bottom SGT structures from upper trench gates wherein said upper trench gates having a gate conductive material therein above said insulation layers to function as gate electrodes for said active semiconductor power cells; and at least one intersecting trench of said plurality of intersecting trenches, which formed between said at least two intersecting trenches, are surrounded by said body region and said at least two intersecting trenches; wherein a trench extension region extending from said at least one intersecting trench to one of said bottom shielded gate trench structures; wherein a source contacting material completely filled in said at least one intersecting trench and completely filled said trench extension region; and wherein said trench extension region completely formed in said semiconductor substrate; wherein said trench extension region is electrically connected directly to said bottom SGT structure; wherein said at least one intersecting trench and said at least two intersecting trenches are identical, and a source metal electrode are electrically connected directly to said source contacting material; wherein said source metal electrode and said source contacting material are formed by different material layers.