Enhanced planarization technique for an integrated circuit
First Claim
Patent Images
1. An integrated circuit fabrication method, comprising the acts of:
- (a.) providing a partially fabricated integrated circuit structure which has an uneven topography containing high points;
(b.) applying and curing spin-on glass, to form a first dielectric;
(c.) depositing dielectric material from a vapor phase, to form a second dielectric layer over said first layer;
(d.) applying and curing spin-on glass, to form a dielectric stack including a third dielectric layer over said first and second layers;
(e.) substantially removing said dielectric stack from said high points of said partially fabricated structure while leaving said dielectric stack in other portions of said partially fabricated structure;
(f.) depositing an interlevel dielectric;
(g.) etching holes in said interlevel dielectric in locations; and
(h.) depositing and patterning a metallization layer to form a pattern of connections, including connections through said holes.
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Abstract
A method for planarizing integrated circuit topographies, wherein, after a first layer of spin-on glass is deposited, a layer of low-temperature oxide is deposited before a second layer of spin-on glass.
49 Citations
21 Claims
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1. An integrated circuit fabrication method, comprising the acts of:
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(a.) providing a partially fabricated integrated circuit structure which has an uneven topography containing high points; (b.) applying and curing spin-on glass, to form a first dielectric; (c.) depositing dielectric material from a vapor phase, to form a second dielectric layer over said first layer; (d.) applying and curing spin-on glass, to form a dielectric stack including a third dielectric layer over said first and second layers; (e.) substantially removing said dielectric stack from said high points of said partially fabricated structure while leaving said dielectric stack in other portions of said partially fabricated structure; (f.) depositing an interlevel dielectric; (g.) etching holes in said interlevel dielectric in locations; and (h.) depositing and patterning a metallization layer to form a pattern of connections, including connections through said holes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An integrated circuit fabrication method, comprising the steps of:
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(a.) providing a partially fabricated integrated circuit structure which has an uneven topography containing high points; (b.) applying and curing spin-on glass, to form a first dielectric; (c.) depositing silicon dioxide from a vapor phase, to form a second dielectric layer over said first layer; (d.) applying and curing spin-on glass, to form a dielectric stack including a third dielectric layer over said first and second layers; (e.) substantially removing said dielectric stack from said high points of said partially fabricated structure while leaving said dielectric stack in other portions of said partially fabricated structure; (f.) depositing an interlevel dielectric; (g.) etching holes in said interlevel dielectric in locations; and (h.) depositing and patterning a metallization layer to form a pattern of connections, including connections through said holes. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An integrated circuit fabrication method, comprising the acts of:
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(a.) providing a partially fabricated integrated circuit structure which has an uneven topography containing high points; (b.) applying and curing spin-on glass, to form a first dielectric layer; (c.) depositing dielectric material from a vapor phase, to form a second dielectric layer over said first layer, said second dielectric layer having a thickness equal to or less than said first layer; (d.) applying and curing spin-on glass, to form a dielectric stack including a third dielectric layer over said first and second layers, said third dielectric layer having a thickness equal to or greater than said second layer; (e.) substantially removing said dielectric stack from said high points of said partially fabricated structure while leaving said dielectric stack in other portions of said partially fabricated structure; (f.) depositing an interlevel dielectric; (g.) etching holes in said interlevel dielectric in locations; and (h.) depositing and patterning a metallization layer to form a pattern of connections, including connections through said holes. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification