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Method of manufacturing a trench MOSFET having trench contacts integrated with trench Schottky rectifiers having planar contacts

Image Number 3 for United States Patent #8034686.

An integrated configuration comprising trench MOSFET having trench contacts and trench Schottky rectifier having planar contacts is disclosed. The trench contacts for trench MOSFET provide a lower specific on-resistance. Besides, for trench gate connection, planar gate contact is employed in the present invention to avoid shortage issue between gate and drain in shallow trench gate. Besides, W plugs filled into both trench contacts and planar contacts enhance the metal step coverage capability.

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