Manufacturing method for semiconductor device
View Patent ↗A method of manufacturing a semiconductor device forms an interlayer insulating film on a nickel silicide layer formed on a substrate, and forms a through hole by performing dry etching using a resist pattern, formed on the interlayer insulating film, as a mask and then removing the resist pattern by ashing. A wafer after an ashing process is cleaned using a cleaning solution comprised of aqueous solution having a content of the fluorine-containing compound of 1.0 to 5.0 mass %, a content of chelating agent of 0.2 to 5.0 mass %, and a content of the organic acid salt of 0.1 to 3.0 mass %.
1. A method of manufacturing a semiconductor device, comprising the steps of:
forming a nickel silicide layer on a substrate;
forming an interlayer insulating film on said nickel silicide layer;
forming a through hole by performing dry etching using a resist pattern, formed on said interlayer insulating film, as a mask and then removing said resist pattern by ashing; and
removing a residue remaining after said dry etching and said ashing by cleaning said substrate with a cleaning solution containing a fluorine-containing compound, chelating agent and an organic acid salt,
wherein the cleaning solution is an aqueous solution that consists of:
1.0 to 5.0 mass % of a fluorine-containing compound;
0.2 to 5.0 mass % of a chelating agent;
0.1 to 3.0 mass % of an organic acid salt; and
water,
wherein said fluorine-containing compound is at least one compound selected from a group consisting of hydrofluoric acid, ammonium fluoride, and amine fluoride,
wherein said chelating agent is selected from a group consisting of chelating agents having an acid dissociation constant pKan of 8.0 or greater at 25° C. when a dissociation stage for a basic acid having a valence of n (n being an integer of 1 or greater) is n-th stage, and
wherein said organic acid salt is selected from carboxylic ammonium salt having an acid dissociation constant pKan of 2.5 or greater at 25° C. when a dissociation stage for a basic acid having a valence of n (n being an integer of 1 or greater) is n-th stage.
2. The method according to claim 1 , wherein said cleaning solution has pH of 7.0 or less.
3. The method according to claim 1 , wherein said nickel silicide layer has a thickness of 50 nm or less.
4. The method according to claim 1 , wherein said nickel silicide layer contains at least one metal selected from a group of Ta, Zr, Co and V.
5. The method according to claim 1 , wherein said nickel silicide layer is doped with arsenic.
6. The method according to claim 1 , wherein said step of removing said residue performs spin type single wafer cleaning on said substrate.
7. The method according to claim 1 , wherein said step of removing said residue uses said cleaning solution recirculatively.
8. The method according to claim 5 , wherein said substrate is doped with phosphorous.
9. The method according to claim 1 , wherein said substrate is Si.