Atomic Layer Deposition Film With Tunable Refractive Index And Absorption Coefficient And Methods Of Making
First Claim
1. A method for forming a film on a substrate, the film having a refractive index and an absorption coefficient, the method comprising:
- exposing the substrate sequentially to a first reactant gas comprising a first species including one or more of silicon, oxygen and nitrogen and a second reactant gas comprising a second species to form a first partial layer on the substrate during a first atomic layer deposition process;
exposing the substrate sequentially to a third reactant gas comprising a third species including one or more of silicon, oxygen and nitrogen and a fourth reactant gas comprising a fourth species to form a second partial layer on the substrate during a second atomic layer deposition process; and
repeating sequentially the first atomic layer deposition process and the second atomic layer deposition process to form a mixed film comprising the first partial layer and the second partial layer,wherein one or more of the refractive index and the absorption coefficient can be altered by changing a ratio of the first partial layer to the second partial layer.
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Abstract
Atomic layer deposition methods of forming one or more of a mixed silicon oxide/silicon nitride film or a mixed silicon oxide/silicon film are described in which the substrate is exposed sequentially to a first reactant gas comprising a silicon species and a second reactant gas comprising an oxygen species to form at least a partial layer of silicon oxide on the substrate during a first atomic layer deposition process. The substrate is then exposed sequentially to a third reactant gas comprising a silicon species and a fourth reactant gas comprising a species sufficient to form at least a partial layer of one or more of silicon nitride or silicon on the substrate during a second atomic layer deposition process. The process can be repeated multiple times to deposit one or more of a mixed silicon oxide/silicon nitride film and a mixed silicon oxide/silicon film.
95 Citations
20 Claims
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1. A method for forming a film on a substrate, the film having a refractive index and an absorption coefficient, the method comprising:
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exposing the substrate sequentially to a first reactant gas comprising a first species including one or more of silicon, oxygen and nitrogen and a second reactant gas comprising a second species to form a first partial layer on the substrate during a first atomic layer deposition process; exposing the substrate sequentially to a third reactant gas comprising a third species including one or more of silicon, oxygen and nitrogen and a fourth reactant gas comprising a fourth species to form a second partial layer on the substrate during a second atomic layer deposition process; and repeating sequentially the first atomic layer deposition process and the second atomic layer deposition process to form a mixed film comprising the first partial layer and the second partial layer, wherein one or more of the refractive index and the absorption coefficient can be altered by changing a ratio of the first partial layer to the second partial layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of forming a mixed film on a substrate, the method comprising:
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(a) disposing a substrate within a processing chamber; (b) performing a first atomic layer deposition process comprising; (i) flowing hexachlorodisilane gas to at least a portion of the substrate within the chamber under conditions which form a partial monolayer on the substrate, the partial monolayer comprising silicon terminated with chlorine, (ii) purging the hexachlorodisilane, (iii) flowing water vapor to the substrate within the chamber under conditions which form a partial monolayer on the substrate, the partial monolayer comprising silicon oxide and (iv) purging the water vapor; (c) performing a second atomic layer deposition process comprising; (i) flowing disilane gas to at least a portion of the substrate within the chamber under conditions which form a partial monolayer comprising silicon, (ii) purging the disilane, (iii) flowing one or more of a nitrogen plasma and a reductant to the substrate within the chamber under conditions to form a partial monolayer comprising one or more of silicon nitride and silicon,and (iv) purging the one or more of nitrogen plasma and reductant; and (d) repeating steps (b) and (c).
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20. A method for forming a film on a substrate, the method comprising:
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exposing the substrate sequentially to a first reactant gas comprising a silicon species and a second reactant gas comprising an oxygen species to form at least a partial layer of silicon oxide on the substrate during a first atomic layer deposition process; exposing the substrate sequentially to a third reactant gas comprising a silicon species and a fourth reactant gas comprising a species to form at least a partial layer of one or more of silicon nitride and silicon on the substrate during a second atomic layer deposition process; and repeating sequentially the first atomic layer deposition process and the second atomic layer deposition process to form one or more of a mixed silicon oxide/silicon nitride film or a mixed silicon oxide/silicon film, the film having a refractive index and absorption coefficient.
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Specification