Patent ID: 11908979
Assignee: APPLIED MATERIALS, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC H

Claim 15:
16. The method of claim 10, wherein the chelating agent comprises a thiourea selected from the group consisting of R1R2N(C═S)NR3R4, where each of R1, R2, R3, and R4 is independently H, benzyl, substituted phenyl groups, C1-C16 linear or branched aliphatic chains, ethylene oxide oligomers such as —(CH2CH2—O)n— with n=1˜50, propylene oxide oligomers such as —(CH2CH(CH3)—O)n— with n=1˜50, copolymers of ethylene oxide and propylene oxide, or dimethylsiloxane oligomers.