Cell capacitor of a dynamic random access memory and a method of manufacturing the same
First Claim
1. A method of manufacturing a cell capacitor of a dynamic random access memory, comprising the steps of:
- forming a trench in a semiconductor substrate;
exposing a portion of said semiconductor substrate, which is located in a region on a side wall of said trench;
forming a semiconductor layer on the side wall of said trench;
causing an electrically conductive layer to be epitaxially and selectively grown only on said semiconductor layer and on the exposed portion of said semiconductor substrate, and integrating said electrically conductive layer during the growth;
forming a gate insulation film on a surface of said electrically conductive layer; and
forming a counter electrode on said gate insulation film and within said trench.
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Accused Products
Abstract
In a cell capacitor of a dynamic random access memory cell according to the present invention, an insulation film is formed on the surface of a fine trench formed in a silicon semiconductor substrate. A contact hole is formed in the insulation film in a region on the side wall of the trench. A polysilicon film is formed on the side wall of the trench in a hollow-cylindrical shape. A silicon layer is epitaxially and selectively grown on the polysilicon film and on the silicon substrate exposed through the contact hole. The polysilicon film and the silicon layer constitute an information storage electrode. At least the silicon layer of the information storage electrode is electrically connected to a source or a drain region of a transfer transistor of the memory cell. A gate insulation film is formed on the surface of the silicon layer. A counter electrode is formed such that the counter electrode is embedded in the trench.
28 Citations
12 Claims
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1. A method of manufacturing a cell capacitor of a dynamic random access memory, comprising the steps of:
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forming a trench in a semiconductor substrate; exposing a portion of said semiconductor substrate, which is located in a region on a side wall of said trench; forming a semiconductor layer on the side wall of said trench; causing an electrically conductive layer to be epitaxially and selectively grown only on said semiconductor layer and on the exposed portion of said semiconductor substrate, and integrating said electrically conductive layer during the growth; forming a gate insulation film on a surface of said electrically conductive layer; and forming a counter electrode on said gate insulation film and within said trench. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of manufacturing a cell capacitor of a dynamic random access memory, comprising the steps of:
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forming a trench in a semiconductor substrate; forming an insulation film on an inner surface of said trench; forming a semiconductor layer on a side wall of said trench; exposing a portion of said semiconductor substrate, which is located in a region on an upper surface of the semiconductor substrate in the vicinity of said trench; causing an electrically conductive layer to be epitaxially and selectively grown only on said semiconductor layer and on the exposed portion of said semiconductor substrate, and integrating said electrically conductive layer during the growth; forming a gate insulation film on the surface of said electrically conductive layer; and forming a counter electrode on said gate insulation film and within said trench. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification