Power semiconductor device

Details Power semiconductor device Power semiconductor device

2005-11-22

2005-11-22

Quach, T. N. (Department: 2826)

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

C257S401000, C257S476000

Reexamination Certificate

active

06967374

ABSTRACT:
There are provided a power switching element including a first semiconductor layer of a first conductivity type; a plurality of second semiconductor layers of a second conductivity type, which are in a columnar shape, and arranged in the first semiconductor layer at certain intervals in a direction parallel to a layer surface of the first semiconductor layer; a first electrode formed on a surface of one side of the first semiconductor layer, the first electrode being electrically connected with the first semiconductor layer; a plurality of third semiconductor layers selectively formed in a surface region of the other side of the first semiconductor layer, the third semiconductor layers being connected to the second semiconductor layers; a fourth semiconductor layer of the first conductivity type selectively formed in a surface region of the third semiconductor layers; second electrodes formed so as to contact surfaces of the third semiconductor layers and the fourth semiconductor layer; and gate electrodes formed on regions of the first semiconductor layer sandwiched between the adjacent third semiconductor layers, gate dielectric films being inserted between the gate electrodes and the first semiconductor layer, and a Schottky barrier diode in which a cathode is connected to the first electrode of the power switching element, and an anode is connected to the second electrodes of the power switching element.

REFERENCES:
patent: 5753938 (1998-05-01), Thapar et al.
patent: 6081009 (2000-06-01), Neilson
patent: 6465844 (2002-10-01), Saito et al.
patent: 6586801 (2003-07-01), Onishi et al.
patent: 6825105 (2004-11-01), Grover et al.
patent: 6849880 (2005-02-01), Saito et al.
patent: 6903418 (2005-06-01), Iwamoto et al.
patent: 2002-156978 (2000-06-01), None
patent: 2002-525853 (2002-08-01), None

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