Vertical MIM Capacitor Structure for High Area Density
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Solution Overview
Problem
Conventional MIM capacitors require a large chip area and additional processing steps, leading to low area density and increased costs due to the need for a capacitor top metal electrode.
Innovation Solution
The development of vertical MIM capacitors with finger-type metal contacts extending vertically on an insulation layer, eliminating the need for an extra mask or etching process to form the capacitor top metal electrode, and allowing for high area density through interlaced electrodes connected to different voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional MIM capacitors use horizontal comb structures with capacitor top metal electrodes, then the capacitance can be achieved, but the chip area occupied is large and manufacturing complexity increases
Solution Approach 1:
The patent transitions from conventional horizontal planar capacitor structures to vertical three-dimensional structures. The capacitor electrodes extend vertically through multiple layers, utilizing the vertical dimension to increase capacitance density without occupying additional horizontal chip area. This dimensional transformation allows achieving the required capacitance values while significantly reducing the footprint on the chip.
Solution Approach 2:
The patent implements nested capacitor structures where capacitor electrodes are embedded within and between conductive interconnect layers. The capacitor dielectric layers are positioned between conductive layers, creating a nested arrangement where capacitor elements are integrated within the existing interconnect stack, maximizing space utilization and reducing overall chip area.
2Manufacturing precision
If conventional MIM capacitors include capacitor top metal electrodes, then the desired capacitance can be achieved, but additional mask and etching processes are required
Solution Approach 1:
The patent merges the capacitor electrode formation process with the existing conductive interconnect layer formation processes. The same conductive layers that serve as interconnects also function as capacitor electrodes, eliminating the need for separate capacitor top metal electrode formation processes, masks, and etching steps. This consolidation reduces manufacturing complexity while maintaining capacitance performance.
Solution Approach 2:
The conductive interconnect layers serve dual functions: acting as both interconnect pathways for signal transmission and as capacitor electrodes for energy storage. This multi-functionality eliminates the need for dedicated capacitor-specific metal layers, reducing the total number of processing steps and simplifying the manufacturing process.
3Manufacturing precision
If conventional MIM capacitors use various horizontal comb structures, then capacitance can be achieved, but area density is low
Solution Approach 1:
The patent employs vertical capacitor structures that extend through the thickness of the interconnect stack, utilizing the vertical dimension to achieve high capacitance values. This vertical arrangement dramatically increases the effective capacitor area within the same horizontal footprint, thereby increasing area density and improving productivity by reducing the total chip area required for a given capacitance.
Solution Approach 2:
The patent uses high-k dielectric materials with elevated dielectric constants to increase capacitance density. By combining these high-k materials with vertical electrode structures, the patent achieves superior area density, allowing more capacitance to be packed into a smaller chip area, thereby improving overall productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves high area density and reduces manufacturing complexity by eliminating unnecessary processing steps while maintaining desired capacitance values.
Implementation Method 1
The capacitance of a capacitor is proportional to the capacitor area and the dielectric constant (k) of the insulation layer, and is inversely proportional to the thickness of the insulation layer
Implementation Method 2
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
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.