Method of making integrated circuit capacitor including tapered plug
First Claim
1. A method of making a capacitor comprising the steps of:
- forming an interconnection line above a substrate;
depositing a first dielectric layer on the interconnection line;
etching a via in the first dielectric layer, the via having a tapered width which increases in a direction toward the substrate;
filling the via with a conductive metal to form a metal plug;
etching a trench in the first dielectric layer around an upper portion of the metal plug;
depositing a second dielectric layer adjacent the metal plug; and
depositing an upper electrode layer on the second dielectric layer.
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Abstract
A method of making a capacitor includes the steps of forming an interconnection line above a substrate, depositing a first dielectric layer on the interconnection line, and etching a via in the first dielectric layer. The via has a tapered width which increases in a direction toward the substrate. Further, the method includes filling the via with a conductive metal to form a metal plug, and etching a trench in the first dielectric layer around an upper portion of the metal plug. The metal plug has a tapered width which secures it into the dielectric layer. A second dielectric layer is deposited adjacent the metal plug and an upper electrode is deposited on the second dielectric layer. Preferably, a lower electrode is deposited to line the trench and contact the metal plug.
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Citations
29 Claims
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1. A method of making a capacitor comprising the steps of:
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forming an interconnection line above a substrate;
depositing a first dielectric layer on the interconnection line;
etching a via in the first dielectric layer, the via having a tapered width which increases in a direction toward the substrate;
filling the via with a conductive metal to form a metal plug;
etching a trench in the first dielectric layer around an upper portion of the metal plug;
depositing a second dielectric layer adjacent the metal plug; and
depositing an upper electrode layer on the second dielectric layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of making an integrated circuit capacitor comprising the steps of:
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forming a first dielectric layer adjacent a substrate;
forming a metal plug comprising an upper portion extending toward an uppermost surface of the first dielectric layer, and a lower portion disposed in the first dielectric layer and having a tapered width which increases in a direction toward the substrate;
forming a trench in the first dielectric layer around the upper portion of the metal plug;
forming a second dielectric layer adjacent the metal plug; and
forming an upper electrode layer on the second dielectric layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
etching a via in the first dielectric layer, the via having a tapered width which increases in the direction toward the substrate; and
filling the via with a conductive metal.
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21. A method according to claim 20, wherein the conductive metal comprises tungsten.
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22. A method of making an integrated circuit capacitor comprising:
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forming a first dielectric layer adjacent a substrate;
forming a metal plug having a tapered width which increases in a direction toward the substrate;
forming a trench in the first dielectric layer to a depth greater than about half a thickness of the first dielectric layer;
forming a second dielectric layer adjacent the metal plug; and
forming an upper electrode layer on the second dielectric layer. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
etching a via in the first dielectric layer, the via having a tapered width which increases in the direction toward the substrate; and
filling the via with a conductive metal.
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25. A method according to claim 22, wherein the tapered width of the via has an angle of taper greater than about 2°
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26. A method according to claim 22, wherein the tapered width of the via has an angle of taper greater than about 5°
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27. A method according to claim 22, further comprising the step of forming an interconnection line extending below the first dielectric layer and connected to the metal plug.
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28. A method according to claim 22, further comprising the step of forming an upper most surface of the upper portion of the metal plug substantially coplanar with an adjacent uppermost surface of the first dielectric layer.
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29. A method according to claim 22, wherein the step of forming the trench comprises forming the trench to a depth greater than about 250 angstroms.
Specification