Method of forming silicon oxide containing films
View Patent ↗A method of forming a silicon oxide film, comprising the steps of: —providing a treatment substrate within a reaction chamber; —purging the gas within the reaction chamber by feeding an inert gas into the chamber under reduced pressure at a substrate temperature of 50 to 400 C, —adsorbing, at the same temperatures and under reduced pressure, a silicon compound on the treatment substrate by pulsewise introduction of a gaseous silicon compound into the reaction chamber, —purging, at the same temperatures and under reduced pressure, the unadsorbed silicon compound in the reaction chamber with an inert gas, —at the same temperatures and under reduced pressure, introducing a pulse of ozone-containing mixed gas into the reaction chamber and producing silicon oxide by an oxidation reaction with the silicon compound adsorbed on the treatment substrate; and—repeating steps 1) to 4) if necessary to obtain the desired thickness on the substrate.
1. A method of forming a silicon oxide containing film comprising the steps of:
(a) providing a substrate into a reaction chamber,
(b) injecting into the reaction chamber at least one silicon containing compound, wherein the at least one silicon containing compound is BDEAS (Bis(diethylamino)silane, SiH 2 (NEt 2 ) 2 );
(c) injecting into the reaction chamber at least one oxygen containing gas, selected from the group consisting of ozone, oxygen and/or moisture (water);
(d) reacting in the reaction chamber by a pulsed chemical vapor deposition (CVD) or atomic layer deposition process at a temperature below 400° C. at least one of the silicon containing compounds and at least one of the oxygen containing gases in order to obtain the silicon oxide containing film deposited onto the substrate; and
(e) Repeating steps (b) to (d) until the desired film thickness is obtained.
2. The method of claim 1 wherein the substrate is heated in the reaction chamber after its introduction, preferably up to the reaction chamber temperature, prior to carrying out steps (b), (c), (d) and/or (e).
3. The method of claim 1 , wherein alternate injection of at least one silicon containing compound and at least one oxygen containing gas is carried out in the reaction chamber.
4. The method of claim 1 , wherein the at least one silicon containing compound or the at least one oxygen containing gas is adsorbed on the surface of the substrate prior to the injection of another silicon containing compound and/or at least one oxygen containing gas.
5. The method of claim 1 , wherein each silicon containing compound and/or oxygen containing gas injection is followed by a purge gas injection in the reaction chamber.
6. The method of claim 1 , wherein silicon containing compounds and/or oxygen containing gas injections are repeated until the desired SiO 2 containing film thickness is obtained.
7. The method of claim 1 , wherein the reaction chamber pressure is at most 100 Torr.
8. The method of claim 1 , wherein the H bond content in the SiO 2 containing film is less than 8.10 21 atoms/cc.
9. The method of claim 1 , wherein the oxygen containing gas is a gas mixture comprising oxygen and ozone with a volume ratio of ozone to oxygen below 20%.
10. The method of claim 9 , wherein the oxygen/ozone gas mixture is diluted with an inert gas.
11. The method of claim 1 , wherein an inert gas is also introduced into the reaction chamber.
12. The method of claim 1 , wherein a small amount of catalyst is introduced into the reaction chamber.