Patent ID: 11895841
Assignee: MACRONIX INTERNATIONAL CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A memory structure, comprising:
a charge trapping layer;
a first silicon oxynitride tunneling film; and
a second silicon oxynitride tunneling film, wherein the first silicon oxynitride tunneling film is between the charge trapping layer and the second silicon oxynitride tunneling film,
a first atom concentration ratio of a concentration of a nitrogen atom to a total concentration of an oxygen atom and the nitrogen atom of the first silicon oxynitride tunneling film is 10% to 50%,
a second atom concentration ratio of a concentration of a nitrogen atom to a total concentration of an oxygen atom and the nitrogen atom of the second silicon oxynitride tunneling film is 1% to 15%,
the concentration of the nitrogen atom of the second silicon oxynitride tunneling film is lower than the concentration of the nitrogen atom of the first silicon oxynitride tunneling film.