Qspeed Semiconductor Inc.

Yang Yu Fan

Richard Francis

Eric Earl Johnson

Jian Li

Hy Hoang

An apparatus and method for a fast recovery rectifier structure. Specifically, the structure includes a substrate of a first dopant. A first epitaxial layer lightly doped with the first dopant is coupled to the substrate. A first metallization layer is coupled to the first epitaxial layer. A plurality of trenches is recessed into the first epitaxial layer, each of which is coupled to the metallization layer. The device also includes a plurality of wells each doped with a second dopant type, wherein each well is formed beneath and adjacent to a corresponding trench. A plurality of oxide layers is formed on walls and a bottom of a corresponding trench. A plurality of channel regions doped with the first dopant is formed within the first epitaxial layer between two corresponding wells. Each of the plurality of channel regions is more highly doped with the first dopant than the first epitaxial layer.

Structure and method for a fast recovery rectifier structure

An ultrafast recovery diode. In a first embodiment, a rectifier device comprises a substrate of a first polarity, a lightly doped layer of the first polarity coupled to the substrate and a metallization layer disposed with the lightly doped layer. The ultrafast recovery diode includes a plurality of wells, separated from one another, formed in the lightly doped layer, comprising doping of a second polarity. The plurality of wells connect to the metallization layer. The ultrafast recovery diode further includes a plurality of regions, located between wells of said plurality of wells, more highly doped of the first polarity than the lightly doped layer.

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Sunnyvale, CA, United States of America

Yang Yu Fan