Single-Mask Resistor and MIM Capacitor Layout for Low Parasitics
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Solution Overview
Problem
The formation of resistors and capacitors in semiconductor ICs using separate mask processes leads to parasitic capacitances and increased manufacturing costs, which degrade high-frequency signal characteristics and complicate the fabrication process.
Innovation Solution
A semiconductor structure is developed with a resistor and MIM capacitor structure formed on a BEOL device layer using a single mask process, reducing parasitic capacitances and manufacturing costs by integrating these components on a shared insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate mask processes are used to form resistors and capacitors, then manufacturing precision can be maintained for each component, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the formation of resistors and capacitors into a single mask process. The method forms an insulating layer, then patterns both resistor and capacitor regions simultaneously using one mask, followed by selective removal of conductive material to create the final structures. This merging reduces fabrication process complexity while maintaining manufacturing precision through careful control of the shared patterning step.
2Reliability
If separate mask processes are used for resistors and capacitors, then each component can be optimized independently, but parasitic capacitances increase degrading high-frequency signal characteristics
Solution Approach 1:
The patent extracts the harmful parasitic capacitance by carefully controlling the spatial relationship between resistor and capacitor structures. The single mask process allows precise positioning of the insulating layer between the two components, effectively separating their electric fields and minimizing parasitic coupling. The method removes conductive material selectively to ensure proper isolation while maintaining optimal signal characteristics.
3Adaptability or versatility
If separate mask processes are used to form resistors and capacitors, then manufacturing flexibility is maintained, but productivity decreases and production costs increase
Solution Approach 1:
The patent merges multiple fabrication steps into a single mask process, forming both resistor and capacitor structures in one patterning operation. This significantly improves productivity by reducing the number of sequential steps. Manufacturing flexibility is maintained through the selective removal process, which allows independent optimization of each component's final geometry despite sharing the initial patterning step.
Data Source
AI summary
The present disclosure discloses a structure and a method directed to a semiconductor structure having a resistor structure and a metal-insulator-metal (MIM) capacitor structure formed by a single mask process. The semiconductor structure includes an interconnect structure on a substrate, a first insulating layer on the interconnect structure, first and second conductive plates on the first insulating layer and separated by a second insulating layer, a dielectric layer on the first conductive plate, and a third conductive plate on the dielectric layer. Bottom surfaces of the first and second conductive plates are coplanar.