Vertical Finger-Type MIM Capacitor Layout Without Extra Masking
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Solution Overview
Problem
Conventional metal-insulator-metal (MIM) capacitors occupy a large layout area, leading to low area density and requiring additional processing steps, such as an extra mask and etching for the capacitor top metal electrode, increasing costs.
Innovation Solution
The development of a novel capacitor structure featuring vertically extending finger-type metal contacts on an insulation layer, eliminating the need for an extra mask or etching process by forming MIM capacitors with interlaced electrodes and a dielectric insulator, achieving high area density without additional processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional MIM capacitors with horizontal comb structures are used, then the capacitance can be achieved, but the chip area occupied is large leading to low area density
Solution Approach 1:
The patent transitions from conventional horizontal comb structures to vertical interdigitated structures, changing the spatial dimension from planar (2D) to vertical (3D). The finger-type electrodes extend vertically from the substrate surface, utilizing the third dimension (height) to increase capacitance without proportionally increasing chip area, thereby improving area density
2Ease of manufacture
If conventional MIM capacitors are formed, then the capacitor structure is achieved, but an extra mask and etching process is required for the capacitor top metal electrode, increasing manufacturing cost
Solution Approach 1:
The patent merges the capacitor electrode formation with the existing interconnect structure. The finger-type electrodes are formed using the same mask and etching processes as the interconnect lines, eliminating the need for a separate capacitor top metal electrode and its associated mask/etching steps. This integration reduces both device complexity and manufacturing cost
3Quantity of substance
If the insulation layer thickness is reduced to increase capacitance, then the capacitance value increases, but the manufacturing precision requirements increase
Solution Approach 1:
Instead of relying solely on reducing insulation layer thickness to increase capacitance, the patent utilizes vertical extension of electrodes and increased electrode surface area through interdigitated structures. This approach increases capacitance by expanding in the vertical dimension and surface area rather than compressing the insulation layer, thereby avoiding increased manufacturing precision requirements for thickness control
Data Source
AI summary
Semiconductor devices and methods are disclosed herein. In one example, a disclosed semiconductor device includes: an insulation layer, a first electrode with sidewalls and a bottom surface in contact with the insulation layer; a second electrode with sidewalls and a bottom surface in contact with the insulation layer; and an insulator formed between the first electrode and the second electrode. The insulator is coupled to a sidewall of the first electrode and coupled to a sidewall of the second electrode.