3D Capacitor Electrode Structure for High-Density IC Miniaturization
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Solution Overview
Problem
The semiconductor industry faces challenges in further miniaturizing semiconductor devices, such as capacitors, to achieve higher density and functionality on smaller IC chip areas, as existing technologies struggle to efficiently form compact capacitor structures with high capacitance and low voltage coefficients.
Innovation Solution
The proposed solution involves a capacitor structure comprising a substrate with a first electrode in the substrate, a second electrode over the substrate, and a third electrode with a middle portion over the second electrode and end portions laterally adjacent to it, all having the same conductivity dopants, along with dielectric layers and conductive wells to enhance capacitance and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional capacitor structures are used, then manufacturing is simpler, but device density and capacitance are insufficient for miniaturization requirements
Solution Approach 1:
The patent implements nesting by placing the third electrode within the lateral footprint of the second electrode, creating a nested configuration where electrodes are arranged in multiple layers vertically. This allows the capacitor to achieve higher density by utilizing three-dimensional space efficiently, with the third electrode positioned over the second electrode while extending laterally adjacent to it, thereby increasing capacitance without proportionally increasing the chip area.
Solution Approach 2:
The patent transitions from a conventional planar two-electrode capacitor to a three-dimensional structure by adding a third electrode that extends in multiple spatial dimensions. The third electrode has a middle portion over the second electrode and end portions laterally adjacent to it, creating a multi-dimensional electrode arrangement that increases the effective capacitance-generating surface area without linearly increasing the chip footprint.
2Area of moving object
If electrode size is reduced for miniaturization, then chip area decreases, but capacitance value drops
Solution Approach 1:
By nesting the third electrode within the lateral boundaries of the second electrode's footprint while extending it vertically, the patent achieves higher capacitance in a compact lateral footprint. The third electrode's middle portion is positioned over the second electrode and its end portions extend laterally adjacent to the second electrode, creating a nested arrangement that maximizes capacitance within the available chip area.
Solution Approach 2:
The patent compensates for reduced electrode lateral dimensions by adding vertical dimensionality through the third electrode. This third electrode extends both vertically over the second electrode and laterally adjacent to it, effectively increasing the total capacitance-generating surface area in three dimensions while maintaining a compact two-dimensional footprint on the chip.
3Reliability
If conventional two-electrode capacitor structures are used, then manufacturing is simpler, but voltage coefficient performance is insufficient
Solution Approach 1:
The patent segments the capacitor into three distinct electrodes instead of two, with the third electrode having a segmented structure with a middle portion and end portions. This segmentation allows for optimized electrical field distribution and improved voltage coefficient performance by creating multiple capacitance-generating interfaces between the first-second and second-third electrode pairs.
Solution Approach 2:
By adding the third electrode that extends both vertically and laterally, the patent creates additional capacitance-generating surfaces that improve voltage coefficient performance. The multi-dimensional arrangement of electrodes provides better electric field control and reduces voltage dependence of capacitance, achieving superior reliability without excessive complexity.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4C
AI summary
A capacitor structure is provided. The capacitor structure includes a substrate, a first electrode, a second electrode, and a third electrode. The first electrode is in the substrate. The second electrode is over the substrate. The third electrode is over the second electrode and includes a middle portion over the second electrode and end portions laterally adjacent to the second electrode.