Inverted Gate Cut Layout for Gate Contact and Lower Capacitance
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Solution Overview
Problem
Conventional semiconductor IC devices face challenges in maintaining switching speeds and reducing current leakage as device dimensions shrink, leading to issues with parasitic capacitance and resistance characteristics due to the geometry of gate cut regions.
Innovation Solution
The introduction of an inverted gate cut region between gate spacers, which creates a larger top contact landing surface area and reduces parasitic capacitance by forming an air pocket, thereby improving resistance characteristics and enabling further scaling of semiconductor IC devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gate cut region geometry is used, then manufacturing is simpler, but parasitic capacitance increases and resistance characteristics deteriorate
Solution Approach 1:
The patent inverts the conventional gate cut region geometry by making the top surface area larger than the bottom surface area. This inversion resolves the technical contradiction by improving resistance characteristics and reducing parasitic capacitance through the reversed geometry, while maintaining manufacturability through standard fabrication processes.
Solution Approach 2:
The patent introduces asymmetric geometry in the gate cut region where the top surface area is deliberately made larger than the bottom surface area. This asymmetry optimizes the electrical characteristics by reducing parasitic capacitance and improving resistance, while the asymmetric structure can still be fabricated using conventional photolithography and etching processes.
2Productivity
If device dimensions are shrunk to follow Moore's law, then device density increases, but switching speeds decrease and current leakage increases
Solution Approach 1:
The patent addresses the limitations of planar scaling by introducing a three-dimensional gate cut region geometry. The inverted geometry with different top and bottom surface areas creates additional dimensional control over electrical characteristics, allowing continued device scaling while maintaining switching performance and reducing leakage through optimized current pathways.
3Reliability
If gate contact landing area is increased, then contact reliability improves, but device footprint increases
Solution Approach 1:
The asymmetric gate cut region geometry allows the top surface area to be larger than the bottom surface area, providing an enlarged contact landing area at the top where contacts are formed. This asymmetry enables improved contact reliability without increasing the overall device footprint, as the larger area is concentrated at the contact level rather than expanding the entire device structure.
Data Source
AI summary
A semiconductor IC device includes an inverted gate cut region with a relatively larger bottom surface area compared to its top surface area. As a result, an associated gate structure may have a relatively larger top contact landing surface area relative to its bottom surface area. The inverted gate cut region may increase a propensity of a frontside gate contact to meld with the gate structure. The increased landing area further enables the frontside contact to be placed in further perimeter locations. The inverted gate cut region also results in improved resistance characteristics through the gate structure. Specifically, the inverted gate cut region enables a wide region between a top channel and the inverted gate cut region that provides a relatively lower electrical resistance therethrough. Similarly, the inverted gate cut region causes a bottom perimeter region with decreased conductive material therein which advantageously results in lower associated parasitic capacitances.