Copper interconnect structure having stuffed diffusion barrier
First Claim
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1. A process for copper metallization comprising:
- depositing a diffusion barrier comprising grain boundaries over a semiconductor substrate;
after depositing the diffusion barrier, separately providing a compounding material and incorporating the compounding material into the diffusion barrier;
depositing a layer of a reactive metal formed to a thickness of about 0.1-2.0 nm over the diffusion baffler;
stuffing the grain boundaries of the diffusion baffler with a compound of the reactive metal from the layer of the reactive metal and the compounding material; and
depositing a layer of copper over the diffusion barrier.
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Abstract
The present invention provides a method of fabricating a semiconductor device, which could advance the commercialization of semiconductor devices with a copper interconnect. In a process of metal interconnect line fabrication, a TiN thin film combined with an Al intermediate layer is used as a diffusion barrier on trench or via walls. For the formation, Al is deposited on the TiN thin film followed by copper filling the trench. Al diffuses to TiN layer and reacts with oxygen or nitrogen, which will stuff grain boundaries efficiently, thereby blocking the diffusion of copper successfully.
50 Citations
44 Claims
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1. A process for copper metallization comprising:
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depositing a diffusion barrier comprising grain boundaries over a semiconductor substrate; after depositing the diffusion barrier, separately providing a compounding material and incorporating the compounding material into the diffusion barrier; depositing a layer of a reactive metal formed to a thickness of about 0.1-2.0 nm over the diffusion baffler; stuffing the grain boundaries of the diffusion baffler with a compound of the reactive metal from the layer of the reactive metal and the compounding material; and depositing a layer of copper over the diffusion barrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A process for copper metallization comprising:
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depositing a metal nitride diffusion barrier comprising grain boundaries over a semiconductor substrate; after depositing the diffusion barrier, separately providing a compounding material and incorporating the compounding material into the diffusion barrier; depositing a layer of a reactive metal formed to a thickness of about 0.1-2.0 nm over the diffusion barrier; moving the reactive metal from the layer of the reactive metal through the grain boundaries of the diffusion barrier to stuff the grain boundaries with a compound of the reactive metal and the compounding material; and depositing a layer of copper over the diffusion barrier. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A process for copper metallization comprising:
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depositing a metal nitride layer on a semiconductor substrate; depositing a layer of a reactive metal over the metal nitride layer, the reactive metal being different from any metal in the metal nitride layer and wherein the reactive metal is selected from the group consisting of Al, Si, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mg, Y and La; depositing a second metal nitride layer directly over and contacting the reactive metal layer; and forming a metal compound in the grain boundaries of the metal nitride layers, the metal compound formed from the reactive metal. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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39. A process of forming a barrier layer during semiconductor metallization comprising:
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depositing a layer of titanium nitride in a damascene trench by atomic layer deposition (ALD); depositing a layer of aluminum on the layer of titanium nitride; and depositing a second layer of titanium nitride directly on and contacting the layer of aluminum. - View Dependent Claims (40, 41, 42, 43, 44)
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Specification