Tandem source activation for cyclical deposition of films
A method includes flowing reactant gases into a process chamber. Plasma having a first power level is supplied using a plasma source. The process chamber is dosed with the precursor. The first power level is sufficient to enhance adsorption of the precursor on a surface of the substrate and is insufficient to decompose the precursor that is adsorbed. After a first predetermined period, the method includes removing a portion of the precursor that does not adsorb onto the substrate. The precursor that is adsorbed is activated using plasma having a second power level using the plasma source. The second power level is greater than the first power level and is sufficient to decompose the precursor.
1. A method for processing a substrate in a substrate processing system, comprising:
a) flowing reactant gases into a process chamber;
b) supplying, from a first power source, plasma having a first power level;
c) dosing the process chamber with precursor, wherein the first power level is sufficient to enhance adsorption of the precursor on a surface of the substrate, and wherein the first power level is insufficient to decompose the precursor that is adsorbed;
d) after a first predetermined period, removing a portion of the precursor that does not adsorb onto the substrate from the process chamber while the plasma having the first power level is still being supplied from the first power source;
e) activating the precursor that is adsorbed using plasma having a second power level supplied from a second power source while the plasma having the first power level is still being supplied from the first power source, wherein the second power level is greater than the first power level and is sufficient to decompose the precursor that is adsorbed; and
f) removing reactants from the process chamber while the plasma having the first power level is still being supplied from the first power source,
wherein the first power level is supplied from the first power source from (b) to (f) such that supplying the plasma having the first power level from the first power source occurs at a same time as supplying the plasma having the second power level from the second power source.
2. The method of claim 1 , wherein (b) is performed using at least one of an inductively coupled plasma source, a capacitively coupled plasma source and a remote plasma source and wherein (e) is performed using at least one of the inductively coupled plasma source, the capacitively coupled plasma source and the remote plasma source.
3. The method of claim 1 , wherein the removal in (f) comprises at least one of purging and evacuating the process chamber.
4. The method of claim 1 , wherein (c) to (f) are repeated to perform atomic layer deposition.
5. The method of claim 1 , wherein (c) to (f) are repeated to perform a cyclical deposition process.
6. The method of claim 2 , wherein the first power level is supplied by the capacitively coupled plasma source and the second power level is supplied by the capacitively coupled plasma source.
7. The method of claim 1 , wherein the first power level is below a first threshold required to permit significant parasitic chemical vapor deposition (CVD) and above a threshold required, to permit low energy activation of the precursors without destruction.