Pulsed deposition layer gap fill with expansion material
First Claim
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1. A method of filling a gap on a semiconductor substrate, the method comprising:
- a) providing in a deposition reaction chamber a semiconductor substrate having a gap on a surface;
b) conformally depositing a dielectric film on the substrate surface until the gap is partially filled, wherein the dielectric film is deposited until the remaining width of the gap is sufficiently narrow such that reactant diffusion limitations prevent conformal deposition;
c) depositing in the remaining gap a second material having the capacity to expand and form dielectric when treated following deposition; and
d) treating the second material following it deposition to cause it to expand and form dielectric;
whereby the gap is filled with dielectric.
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Abstract
Conformal dielectric deposition processes supplemented with a deposited expansion material can fill high aspect ratio narrow width gaps with significantly reduced incidence of voids or weak spots. The technique can also be used generally to form composites, such as for the densification of any substrate having open spaces or gaps to be filled without the incidence of voids or seams.
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Citations
23 Claims
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1. A method of filling a gap on a semiconductor substrate, the method comprising:
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a) providing in a deposition reaction chamber a semiconductor substrate having a gap on a surface; b) conformally depositing a dielectric film on the substrate surface until the gap is partially filled, wherein the dielectric film is deposited until the remaining width of the gap is sufficiently narrow such that reactant diffusion limitations prevent conformal deposition; c) depositing in the remaining gap a second material having the capacity to expand and form dielectric when treated following deposition; and d) treating the second material following it deposition to cause it to expand and form dielectric; whereby the gap is filled with dielectric. - 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 method of forming a composite structure, the method comprising:
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a) providing in a deposition reaction chamber a porous or fibrous substrate; b) depositing on the substrate surface a second material having the capacity to expand and form dielectric when treated following deposition; and c) treating the second material following its deposition to cause it to expand; whereby the composite is formed. - View Dependent Claims (22, 23)
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Specification