Wet oxidation process performed on a dielectric material formed from a flowable CVD process
Methods of performing a wet oxidation process on a silicon containing dielectric material filling within trenches or vias defined within a substrate are provided. In one embodiment, a method of forming a dielectric material on a substrate includes forming a dielectric material on a substrate by a flowable CVD process, curing the dielectric material disposed on the substrate, performing a wet oxidation process on the dielectric material disposed on the substrate, and forming an oxidized dielectric material on the substrate.
1. A method of forming an oxidized material on a substrate, comprising:
forming a silicon containing layer on a substrate by a flowable CVD process comprising exposing the substrate to trisilylamine and ammonia;
removing moisture from the silicon containing layer disposed on the substrate;
subsequently immersing the silicon containing layer into a processing solution having an oxygen source, wherein the oxygen source in the processing solution at least partially replaces silicon nitrogen or silicon hydrogen bonds in the silicon containing layer with silicon oxygen bonds; and
forming an oxidized silicon containing layer on the substrate.
2. The method of claim 1 , wherein the processing solution includes an oxygen source disposed in deionized (DI) water.
3. The method of claim 2 , wherein the oxygen source is O 3 .
4. The method of claim 1 further comprising:
performing a thermal anneal process on the oxidized silicon containing layer to anneal the substrate to a temperature between about 100 degrees Celsius and about 1000 degrees Celsius.
5. A method of forming an oxidized dielectric material on a substrate, comprising:
forming a silicon containing layer on a substrate by a flowable CVD process, wherein the silicon containing layer is formed by exposure to a gas mixture containing trisilylamine (TSA) and NH 3 ;
curing the silicon containing layer disposed on the substrate;
subsequently wetting the silicon containing layer with a processing solution having O 3 disposed in deionized (DI) water, wherein the ozone disposed in the deionized (DI) water has a concentration between about 1 milligram (mg) per liter (L) and about 1000 milligram (mg) per liter (L); and
forming an oxidized silicon containing layer on the substrate.
6. The method of claim 5 , wherein the oxygen source provided from O 3 in the processing solution at least partially coverts silicon nitrogen or silicon hydrogen bonding formed in the silicon containing layer into silicon oxygen bonding.
7. The method of claim 5 , further comprising:
performing a thermal anneal process on the oxidized silicon containing layer to anneal the substrate to a temperature between about 100 degrees Celsius and about 1000 degrees Celsius.