Patent ID: 11955341
Assignee: VERSUM MATERIALS US, LLC
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 0:
1. An etching solution suitable for the selective removal of silicon nitride over silicon oxide from a microelectronic device, consisting of:
water;
about 59.5 to about 85 wt % neat phosphoric acid;
an organosilicon compound which is selected from the group consisting of trimethoxymethylsilane, dimethoxydimethylsilane, triethoxymethylsilane, diethoxydimethylsilane, trimethoxysilane, dimethoxymethylsilane, di-isopropyldimethoxysilane, diethoxymethylsilane, dimethoxyvinylmethylsilane, dimethoxydivinylsilane, diethoxyvinylmethylsilane and diethoxydivinylsilane;
silicic acid; and
a hydroxyl group-containing water-miscible solvent.