METHOD FOR MANUFACTURING CAPACITOR LOWER ELECTRODES OF SEMICONDUCTOR MEMORY
First Claim
1. A method for manufacturing capacitor lower electrodes of a semiconductor memory, comprising the steps of:
- forming a first stacked structure over a semiconductor substrate which has a plurality of conductive plugs;
etching the first stacked structure to form a plurality of first trenches in which the conductive plugs are exposed;
disposing a conductive metal material within each of the first trenches to cover the conductive plugs;
disposing a solid first conducting cylindrical structure within each of the first trenches, the first conducting cylindrical structures are deposited over the conductive metal materials;
forming a second stacked structure on the first stacked structure;
etching the second stacked structure to form a plurality of second trenches in which the first conducting cylindrical structures are exposed; and
disposing a solid second conducting cylindrical structure within each of the second trenches, second conducting cylindrical structures are deposited over the first conducting cylindrical structures.
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Accused Products
Abstract
A method for manufacturing capacitor lower electrodes of a semiconductor memory firstly forms a first stacked structure over a semiconductor substrate which has a plurality of conductive plugs. Then a second stacked structure is formed on the first stacked structure; furthermore, a plurality of trenches extending from a top surface of the second stacked structure to a bottom surface of the first stacked structure are formed and expose the conducting plugs; finally, conductive metal materials and solid conducting cylindrical structures are deposited in the trenches in turn, and the conductive metal materials contact with the conductive plugs and the conducting cylindrical structures. Each conducting cylindrical structure is a capacitor lower electrode. Accordingly, the present invention can increase the supporting stress of the capacitor lower electrodes and further reduce the difficulty in disposing of capacitor upper electrodes and capacitor dielectric layers outside the capacitor lower electrodes.
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Citations
20 Claims
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1. A method for manufacturing capacitor lower electrodes of a semiconductor memory, comprising the steps of:
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forming a first stacked structure over a semiconductor substrate which has a plurality of conductive plugs; etching the first stacked structure to form a plurality of first trenches in which the conductive plugs are exposed; disposing a conductive metal material within each of the first trenches to cover the conductive plugs; disposing a solid first conducting cylindrical structure within each of the first trenches, the first conducting cylindrical structures are deposited over the conductive metal materials; forming a second stacked structure on the first stacked structure; etching the second stacked structure to form a plurality of second trenches in which the first conducting cylindrical structures are exposed; and disposing a solid second conducting cylindrical structure within each of the second trenches, second conducting cylindrical structures are deposited over the first conducting cylindrical structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for manufacturing capacitor lower electrodes of a semiconductor memory, comprising the steps of:
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forming a first stacked structure over a semiconductor substrate which has a plurality of conductive plugs; forming a second stacked structure on the first stacked structure; etching the first stacked structure and the second stacked structure to form a plurality of trenches extending from a top surface of the second stacked structure to a bottom surface of the first stacked structure, in which the conducting plugs are exposed in the trenches; disposing a conductive metal material within each of the trenches to cover the conductive plugs; and disposing a cylindrical capacitor lower electrode within each of the trenches, the capacitor lower electrodes are deposited over the conductive metal materials. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification