MIM capacitor and associated production method

A method for producing an MIM capacitor with the steps of:

• forming a first capacitor electrode in the planar surface of a first intermediate dielectric;
• forming a second intermediate dielectric on the first intermediate dielectric and the first capacitor electrode;
• forming an opening in the second intermediate dielectric for exposing at least part of the first capacitor electrode, the opening having sidewalls:
• selectively forming a first electrically conducting diffusion barrier layer within the opening, on the surface of the exposed first capacitor electrode, after forming the opening in the second intermediate dielectric layer, such that the sidewalls of the opening is at least partially free of the first electrically conducting diffusion barrier layer;
• forming a capacitor dielectric over the full surface area on the surface of the first electrically conducting diffusion barrier layer and the second intermediate dielectric and at least partially in direct contact with the sidewalls of the opening;
• forming a second electrically conducting diffusion barrier layer over the full surface area on the surface of the capacitor dielectric as the second capacitor electrode;
• forming a third intermediate dielectric over the full surface area on the second capacitor electrode;
• performing a planarization down to the second intermediate dielectric;
• forming a further intermediate dielectric on the planarized surface;
• and
• forming a multiplicity of contact vias in the further intermediate dielectric, the multiplicity of contact vias contacting the second capacitor electrode;
• wherein, in forming the second electrically conducting diffusion barrier layer,
• forming the second capacitor electrode with a layer thickness which is greater than the layer thickness of the first diffusion barrier layer and less than half the layer thickness of the second intermediate dielectric;
• further comprising:
• wherein before forming the second intermediate dielectric,
• forming a first electrically insulating diffusion barrier layer on the surface of the first intermediate dielectric and the first capacitor electrode;
• and
• wherein, in forming the opening, forming the opening in the first electrically insulating diffusion barrier layer.