Method to obtain SiC class of films of desired composition and film properties
Provided are methods and systems for providing silicon carbide class of films. The composition of the silicon carbide film can be controlled by the choice of the combination of precursors and the ratio of flow rates between the precursors. The silicon carbide films can be deposited on a substrate by flowing two different organo-silicon precursors to mix together in a reaction chamber. The organo-silicon precursors react with one or more radicals in a substantially low energy state to form the silicon carbide film. The one or more radicals can be formed in a remote plasma source.
1. An apparatus for depositing a silicon carbide film on a substrate, the apparatus comprising:
a reaction chamber comprising the substrate;
a remote plasma source coupled to the reaction chamber and configured to generate a plasma outside the reaction chamber;
one or more first gas inlets coupled to the reaction chamber;
a second gas inlet coupled to the reaction chamber, wherein a distance between the second gas inlet and the one or more first gas inlets is between about 5 cm and about 20 cm; and
a controller comprising instructions for performing the following operations:
flowing a first organo-silicon precursor through the one or more first gas inlets into the reaction chamber;
flowing a second organo-silicon precursor through the one or more first gas inlets into the reaction chamber to mix with the first organo-silicon precursor, wherein the second organo-silicon precursor is different from the first organo-silicon precursor;
generating hydrogen radical species from a hydrogen source gas (H 2 ) in the remote plasma source; and
flowing the hydrogen radical species through the second gas inlet into the reaction chamber, wherein the hydrogen radical species in an environment adjacent to the substrate react with the first organo-silicon precursor and the second organo-silicon precursor to form the silicon carbide film on the substrate.
2. The apparatus of claim 1 , wherein all or substantially all of the hydrogen radical species generated from the hydrogen source gas are in a ground state in the environment adjacent to the substrate.
3. The apparatus of claim 1 , wherein the silicon carbide film is doped with nitrogen and/or oxygen.
4. The apparatus of claim 3 , wherein the silicon carbide film is a nitrogen doped silicon carbide film, the first organo-silicon precursor and the second organo-silicon precursor each having different ratios of silicon-carbon bonds to silicon-nitrogen bonds.
5. The apparatus of claim 3 , wherein the silicon carbide film is an oxygen doped silicon carbide film, the first organo-silicon precursor and the second organo-silicon precursor each having different ratios of silicon-carbon bonds to silicon-oxygen bonds.
6. The apparatus of claim 3 , wherein the silicon carbide film is an oxygen and nitrogen doped silicon carbide film, the first organo-silicon precursor having one or more silicon-oxygen bonds and the second organo-silicon precursor having one or more silicon-nitrogen bonds.
7. The apparatus of claim 1 , wherein the controller is configured to flow each of the first and the second organo-silicon precursor at flow rates having a ratio of between about 1:1 and about 2:1.
8. The apparatus of claim 1 , wherein each of the first organo-silicon precursor and the second organo-silicon precursor has one or more silicon-hydrogen bonds and/or silicon-silicon bonds.
9. The apparatus of claim 1 , wherein one of the first or the second organo-silicon precursors are cyclic siloxanes.
10. The apparatus of claim 1 , wherein one of the first or the second organo-silicon precursors are alkoxy silanes.
11. The apparatus of claim 1 , wherein one of the first or the second organo-silicon precursors are alkyl silanes.
12. The apparatus of claim 1 , wherein the hydrogen radicals species in the environment adjacent to the substrate have an energy sufficient to break one or both of silicon-hydrogen bonds and silicon-silicon bonds but preserve silicon-oxygen, silicon-nitrogen, and silicon-carbon bonds, the broken silicon-hydrogen bonds and broken silicon-silicon bonds capable of cross-linking.
13. The apparatus of claim 1 , wherein the controller further comprises instructions for performing the following operation:
providing process conditions such that the hydrogen radical species are in a ground state in the environment adjacent to the substrate to react with the first organo-silicon precursor and the second organosilicon precursor.