Method of manufacturing a semiconductor MOSFET having a projection T-shaped semiconductor portion
First Claim
1. A method of manufacturing a MOSFET having a projecting semiconductor portion, comprising the steps of:
- (a) providing a semiconductor body;
(b) forming a mask layer on the semiconductor body, the mask layer having a hole which exposes the semiconductor body;
(c) forming a semiconductor layer with a base portion in the hole extending from the semiconductor body and with a t op portion on the mask layer around the hole, a cross section of the semiconductor layer having the shape of a T with a base along the base portion and a top along the top portion;
(d) removing the mask layer by wet etching to expose the surface of the base portion of the semiconductor layer;
(e) forming a gate insulating layer on the exposed surface of the base portion of the semiconductor layer;
(f) forming a gate electrode layer on the gate insulating layer; and
(g) introducing impurities into the top portion of the semiconductor layer and a predetermined region of the semiconductor body located adjacent to said semiconductor layer.
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Accused Products
Abstract
A MOSFET having a projecting T-shaped semiconductor portion and a method of manufacturing the same. The MOSFET includes a semiconductor body having a first diffusion region of a first conductivity type, a T-shaped semiconductor portion projecting from the semiconductor body, a gate insulator film formed on a surface of said T-shaped portion, and a gate electrode formed on the gate insulator film. The top of the T provides a means by which contact can easily be made between a highly concentrated impurity region on the projecting portion and an electrode, even if the cross-sectional area of the base of the T is narrow. In a method of manufacturing the MOSFET a mask layer is placed on the semiconductor body with a hole which exposes the semiconductor body, a layer of semiconductor material is provided in the hole and on a portion of the mask layer around the hole so as to form the T-shaped portion, the mask layer is removed by the wet etching, a gate insulating layer is formed onside surfaces of the T-shaped portion, a gate electrode layer is formed on the gate insulating layer, and an impurity is introduced into the top of the T-shaped portion and a predetermined region of the semiconductor body located adjacent to the T-shaped portion.
33 Citations
15 Claims
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1. A method of manufacturing a MOSFET having a projecting semiconductor portion, comprising the steps of:
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(a) providing a semiconductor body; (b) forming a mask layer on the semiconductor body, the mask layer having a hole which exposes the semiconductor body; (c) forming a semiconductor layer with a base portion in the hole extending from the semiconductor body and with a t op portion on the mask layer around the hole, a cross section of the semiconductor layer having the shape of a T with a base along the base portion and a top along the top portion; (d) removing the mask layer by wet etching to expose the surface of the base portion of the semiconductor layer; (e) forming a gate insulating layer on the exposed surface of the base portion of the semiconductor layer; (f) forming a gate electrode layer on the gate insulating layer; and (g) introducing impurities into the top portion of the semiconductor layer and a predetermined region of the semiconductor body located adjacent to said semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of manufacturing a MOSFET having a projecting semiconductor portion comprising the steps of:
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providing a semiconductor body; forming a mask layer on the semiconductor body with the mask layer having a hole which exposes a surface of the semiconductor body and which is defined by an interior surface of the mask layer; forming a semiconductor layer having a first portion which is disposed in the hole, is connected to the semiconductor body and has a peripheral surface contacting said interior surface of the mask layer, and a second portion disposed on the first portion and extending laterally on the outer surface of the mask layer around the hole so that a cross section of the semiconductor layer has a T-shape with a base along the first portion and a top along the second portion; removing the mask layer by wet etching to expose the peripheral surface of the first portion of the semiconductor layer; forming a gate insulating layer on the peripheral surface of the first portion of the semiconductor layer; forming a gate electrode layer on the gate insulating layer; and introducing impurities into the second portion of the semiconductor layer and into a predetermined region of the semiconductor body disposed adjacent the first portion of the semiconductor layer to form source and drain regions. - View Dependent Claims (15)
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Specification