Plasma treatment of an interconnect surface during formation of an interlayer dielectric

A method of forming a semiconductor structure including providing a substrate having a first dielectric upper layer;

• forming a depression in said first dielectric upper layer;
• filling said depression with an electrically conductive film having an upper surface that is substantially coplanar to said first dielectric upper layer, said method comprising:
• reacting a chemical composition with at least one monolayer of said upper surface to form a passivation layer having a thickness not greater than about 50 .ANG. upon the upper surface;
• and
• forming a second dielectric upper layer over said electrically conductive film and said first dielectric upper layer, wherein said electrically conductive film is unoxidized and wherein said second dielectric upper layer is adhered to said electrically conductive film.

A method of resisting oxidation of an interconnect including providing a substrate having a first dielectric upper layer;

• patterning a mask upon said first dielectric upper layer;
• anisotropically dry etching said first dielectric upper layer to form a depression that extends to an electrically conductive structure beneath said first dielectric upper layer;
• depositing a metal or metal alloy upon said substrate to fill said depression with an electrically conductive film having a resistance to oxidation and having an upper surface that is substantially coplanar to said first dielectric upper layer;
• removing said metal or metal alloy from said first dielectric upper layer above said depression, said method comprising:
• reacting a chemical composition with at least one monolayer of said upper surface to form a compound having a higher resistance to oxidation than said electrically conductive film, wherein said composition is adhered to said electrically conductive film;
• and
• forming a second dielectric upper layer over said electrically conductive film and said first dielectric upper layer, wherein said second dielectric upper layer remains adhered to said compound.

A method of depositing an ILD upon an interconnect including providing a substrate having a first dielectric upper layer;

• patterning a mask upon said first dielectric upper layer;
• anisotropically dry etching said first dielectric upper layer to form a depression that extends to an electrically conductive structure beneath said first dielectric upper layer;
• depositing a metal upon said substrate to fill said depression with an electrically conductive film having a first resistance to oxidation and an upper surface that is substantially coplanar to said first dielectric upper layer;
• and removing said metal from said first dielectric upper layer above said depression, said method comprising:
• providing a nitrogen-containing composition;
• heating said first dielectric upper layer to a temperature of less than or equal to about 400.degree. C.;
• exposing said upper surface to a said nitrogen-containing composition;
• reacting said nitrogen-containing composition with at least one monolayer of said electrically conductive film;
• forming a compound out of said at least one monolayer and said nitrogen-containing composition, said compound having a second resistance to oxidation that is greater than said first resistance to oxidation;
• and
• forming a second dielectric upper layer over said electrically conductive film, and said first dielectric upper layer, wherein said electrically conductive film is unoxidized and wherein said second dielectric upper layer is adhered to said electrically conductive film.

A method of passivating an exposed metal in a semiconductor device including providing a substrate having a first dielectric upper layer;

• forming a depression is first dielectric upper layer that extends to an electrically conductive structure;
• depositing a metal or metal alloy upon said substrate to fill said depression with an electrically conductive film having a first resistance to oxidation and an upper surface that is substantially coplanar to said first dielectric upper layer;
• and removing said metal or metal alloy from said first dielectric upper layer above said depression, said method comprising:
• providing a nitrogen-containing composition;
• heating said first dielectric upper layer to a temperature of less than or equal to about 400.degree. C.;
• exposing said upper surface to said nitrogen-containing composition to react said nitrogen-containing composition with at least one monolayer of said upper surface of said electrically conductive film;
• and
• in situ depositing a second dielectric upper layer over said electrically conductive film and said first dielectric upper layer while simultaneously reacting said nitrogen-containing composition with said at least one monolayer of said upper surface to form a compound having a second resistance to oxidation that is greater than said first resistance to oxidation wherein said electrically conductive film is unoxidized and wherein said second dielectric upper layer is adhered to said electrically conductive film.

A method of resisting the formation of tungsten oxide upon an exposed tungsten interconnect including providing a substrate having a first dielectric upper layer;

• forming a depression is first dielectric upper layer that extends to an electrically conductive structure;
• depositing tungsten upon said substrate to fill said depression with an electrically conductive film having a first resistance to oxidation and an upper surface that is substantially coplanar to said first dielectric upper layer;
• and removing said tungsten from said first dielectric upper layer above said depression said method comprising:
• providing a nitrogen-containing composition;
• heating said first dielectric upper layer to a temperature of less than or equal to about 400.degree. C.;
• exposing said upper surface to a said nitrogen-containing composition;
• reacting said nitrogen-containing composition with said at least one monolayer of said upper surface to form a compound having a second resistance to oxidation that is greater than said first resistance to oxidation;
• and
• in situ depositing a second dielectric upper layer over said electrically conductive film and said first dielectric upper layer.

A method of forming a refractory metal interconnect including providing a semiconductor substrate;

• forming a first silicon dioxide layer having an upper surface upon an electrically conductive film;
• patterning a masking layer upon said silicon dioxide layer;
• forming a contact corridor through said masking layer into said first silicon dioxide layer, said contact corridor extending to said electrically conductive film;
• depositing a refractory metal liner layer within said contact corridor upon said electrically conductive film and upon said silicon dioxide layer;
• forming a refractory metal nitride layer upon said refractory metal liner layer;
• filling said contact corridor with refractory metal;
• and planarizing said refractory metal in said contact corridor to form a refractory metal upper surface that is level with said upper surface of said silicon dioxide layer, said method comprising:
• reacting ammonia with at least one monolayer of said refractory metal upper surface to form a refractory metal nitride compound;
• and
• forming a second silicon dioxide layer over said refractory metal nitride compound and over said silicon dioxide layer wherein said refractory metal nitride layer remains adhered to said refractory metal.

A method of forming a tungsten metal interconnect including:

• providing a semiconductor substrate;
• forming a silicon dioxide layer having an upper surface upon an electrically conductive film;
• patterning a masking layer upon said silicon dioxide layer;
• forming a contact corridor through said masking layer into said silicon dioxide layer, said contact corridor extending to said electrically conductive film;
• depositing a titanium liner layer within said contact corridor upon said electrically conductive film and upon said silicon dioxide layer;
• forming a titanium nitride layer upon said titanium liner layer;
• filling said contact corridor with tungsten;
• and planarizing the tungsten in said contact corridor to form a tungsten upper surface that is level with said upper surface of said silicon dioxide layer, said method comprising:
• reacting ammonia with at least one monolayer of said tungsten upper surface to form a tungsten nitride compound, said tungsten nitride compound being adhered to said at least one monolayer;
• and
• forming a second silicon dioxide layer over said tungsten nitride compound and over said silicon dioxide layer, said second silicon dioxide layer being adhered to said tungsten nitride compound.