Ruthenium film forming method and substrate processing system
A ruthenium film forming method includes: causing chlorine to be adsorbed to an upper portion of a recess at a higher density than to a lower portion of the recess by supplying a chlorine-containing gas to a substrate including an insulating film and having the recess; and forming a ruthenium film in the recess by supplying a Ru-containing precursor to the recess to which the chlorine is adsorbed.
1. A ruthenium film forming method in a substrate processing system, comprising:
a plurality of processing containers connected to a vacuum transfer chamber;
a controller configured to perform steps of;
forming an inhibition layer in a recess by supplying a chlorine-containing gas to a substrate including an insulating film and having the recess in a depressurized state; and
forming a ruthenium film in the recess by supplying a Ru-containing precursor to the recess in which the inhibition layer is formed in the depressurized state,
wherein the forming the inhibition layer includes adsorbing chlorine to a top surface and an upper portion of a side surface of the recess without adsorbing chlorine to a bottom surface and a lower portion of the side surface of the recess, so that in the forming the ruthenium film, the chlorine adsorbed to the recess inhibits adsorption of the Ru-containing precursor to the recess, and
wherein the forming the inhibition layer and the forming the ruthenium film are alternately and repeatedly executed to perform bottom-up formation in which film formation gradually progresses upward from the bottom surface of the recess.
2. The method of claim 1 , wherein the forming the inhibition layer includes supplying the chlorine-containing gas by activating the chlorine-containing gas with plasma.
3. The method of claim 1 , further comprising:
removing an oxide film formed on the bottom surface of the recess by supplying the chlorine-containing gas to the recess before the forming the inhibition layer.
4. The method of claim 3 , wherein the forming the inhibition layer and the forming the ruthenium film are performed in different processing containers of the plurality of the processing containers connected via the vacuum transfer chamber.
5. The method of claim 4 , wherein the chlorine-containing gas is a Cl 2 gas, and the Ru-containing precursor is Ru 3 (CO) 12 .
6. The method of claim 1 , wherein the forming the inhibition layer and the forming the ruthenium film are performed in different processing containers of the plurality of the processing containers connected via the vacuum transfer chamber.
7. The method of claim 1 , wherein the forming the inhibition layer and the forming the ruthenium film are performed in a same processing container of the plurality of the processing containers.
8. The method of claim 1 , wherein the chlorine-containing gas is a Cl 2 gas, and the Ru-containing precursor is Ru 3 (CO) 12 .