Patent ID: 11917923
Assignee: WINBOND ELECTRONICS CORP.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 6:
7. A magnetoresistive random access memory (MRAM) structure, comprising:
a substrate;
multiple MRAM cells on said substrate, wherein said MRAM cells are in a cell region adjacent to a logic region;
an atomic layer deposition dielectric layer between said MRAM cells and at outer sides of said MRAM cells in said cell region; and
an ultra low-k layer covering directly on said MRAM cells and said atomic layer deposition dielectric layer and covering entire said logic region and said cell region, wherein metal layers and vias on said logic region are formed in said ultra low-k layer, and said ultra low-k layer comprises a fluorine doped surface portion, and a silicon percentage, a hydrogen percentage and a carbon percentage in said ultra low-k layer gradually increase inward from the top surface of said ultra low-k layer and then remain constant, and an oxygen percentage in said ultra low-k layer gradually decreases inward from said top surface of said ultra low-k layer and then remain constant, and a fluorine percentage in said ultra low-k layer gradually increases inward from said top surface of said ultra low-k layer to a depth and then start to decrease gradually to 0%, and said carbon percentage, said hydrogen percentage, said silicon percentage and said oxygen percentage are substantially the same at said top surface of said ultra low-k layer.