Patent ID: 9691629
Date: 2017-06-27
CPC Classifications: B65D,C09K,G03F,H01L

Claim:
1. A method of removing silicon nitride from a microelectronic device, said method comprising contacting the microelectronic device with a removal composition for sufficient time under sufficient conditions to at least partially remove said silicon nitride material from the microelectronic device, wherein the removal composition includes fluorosilicic acid, silicic acid, and at least one organic solvent, wherein the selectivity of silicon nitride to silicon oxide(s) in the presence of the removal composition is in a range from about 10:1 to about 7,000:1 at temperature of 40-120° C., wherein the molar ratio of fluorosilicic acid to silicic acid is in a range from about 3:1 to about 10:1.