Patent ID: 11908888
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of fabricating a metal-insulator-metal (MIM) capacitor structure, the method comprising:
forming a substrate including a first capacitance region and a second capacitance region;
forming a first capacitor stack including a first number of conformal plate layers that produce a first maximum operating voltage (Vmax) in the first capacitance region; and
forming a second capacitor stack including a second number of conformal plate layers which is different than the first number of conformal plate layers that produce a second Vmax in the second capacitance region, the second Vmax being different from the first Vmax,
wherein forming the first and second capacitor stacks comprises:
depositing a first conformal plate layer in the first capacitance region and the second capacitance region;
selectively removing one or more portions of the first conformal plate layer;
depositing a first conformal insulator layer on an upper surface of the first conformal plate layer, the first conformal insulator layer extending into the first capacitance region and the second capacitance region;
depositing a second conformal plate layer on an upper surface of the first conformal insulator layer, the second conformal plate layer extending into the first capacitance region and the second capacitance region;
removing a portion of the second conformal plate layer located in the first capacitance region, while completely removing the second conformal plate layer from the second capacitance region to expose the first conformal insulator plate layer; and
depositing a second conformal insulator that covers the maintained portion of the second conformal plate layer located in the first capacitance region and the exposed first conformal insulator layer located in the second capacitance region.