MOS-transistor with separated electrodes arranged in a trench
First Claim
1. A method for producing a trench transistor, the method comprising:
- providing a semiconductor body;
forming a first trench in the semiconductor body, the first trench comprising two side walls and a bottom surface;
forming a first isolation layer on inner surfaces of the first trench;
filling the first trench with conductive material to form a first electrode within the first trench;
removing a portion of the first electrode along one of the side walls of the first trench to form a cavity in the first electrode, the cavity being located within the first trench;
forming a second isolation layer on inner surfaces of the cavity;
at least partially filling the cavity with conductive material to form a second electrode within the cavity;
forming a structured third isolation layer on a top surface of the semiconductor body; and
forming a metallization layer on the structured third isolation layer, wherein the first or the second electrode is electrically and thermally connected to the metallization layer via openings in the structured third isolation layer.
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Accused Products
Abstract
A MOS transistor is produced by forming a first trench in a semiconductor body, forming a first isolation layer on inner surfaces of the first trench, and filling the first trench with conductive material to form a first electrode within the first trench. A portion of the first electrode is removed along one side wall of the first trench to form a cavity located within the first trench. A second isolation layer is formed on inner surfaces of the cavity, and the cavity is at least partially filled with conductive material to form a second electrode within the cavity. A structured third isolation layer is formed on a top surface of the semiconductor body, and a metallization layer is formed on the structured third isolation layer. The first or the second electrode is electrically and thermally connected to the metallization layer via openings in the structured third isolation layer.
7 Citations
24 Claims
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1. A method for producing a trench transistor, the method comprising:
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providing a semiconductor body; forming a first trench in the semiconductor body, the first trench comprising two side walls and a bottom surface; forming a first isolation layer on inner surfaces of the first trench; filling the first trench with conductive material to form a first electrode within the first trench; removing a portion of the first electrode along one of the side walls of the first trench to form a cavity in the first electrode, the cavity being located within the first trench; forming a second isolation layer on inner surfaces of the cavity; at least partially filling the cavity with conductive material to form a second electrode within the cavity; forming a structured third isolation layer on a top surface of the semiconductor body; and forming a metallization layer on the structured third isolation layer, wherein the first or the second electrode is electrically and thermally connected to the metallization layer via openings in the structured third isolation layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for producing a trench transistor, the method comprising:
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providing a semiconductor body; forming a first trench in the semiconductor body; forming a first isolation layer on inner surfaces of the first trench; filling the first trench with conductive material to form a first electrode within the first trench; forming a second trench in the semiconductor body directly adjoining the first trench, wherein forming the second trench comprises exposing a side surface of the first electrode or the first isolation layer, the side surface of the first electrode or the first isolation layer extending between a main lateral surface of the semiconductor body and a bottom of the first trench; forming a second isolation layer on inner surfaces of the second trench; at least partially filling second trench with conductive material to form a second electrode within the second trench; forming a structured third isolation layer on a top surface of the semiconductor body; and forming a metallization layer on the structured third isolation layer, wherein the first or the second electrode is electrically and thermally connected to the metallization layer via openings in the structured third isolation layer. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification