MIM Capacitor and Low TCR Resistor Single-Mask Patterning
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Solution Overview
Problem
Conventional semiconductor manufacturing requires an extra photolithography step to define low TCR metal resistors, increasing fabrication cost, time, and resource utilization when integrating MIM capacitors and low TCR metal resistors in CMOS technologies.
Innovation Solution
Simultaneously defining the top metal plate of the MIM capacitor and the metal thin film of the low TCR metal resistor during a common patterning step using a same mask layer, thereby eliminating the need for additional photolithography steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an extra photolithography step is used to define the low TCR metal resistor, then the resistor can be properly formed with correct dimensions and properties, but the fabrication complexity, cost, and time increase
Solution Approach 1:
The patent combines the definition of the low TCR metal resistor and the top metal plate of the MIM capacitor into a single photolithography step. By using a common patterning process with appropriately designed mask layers, both structures are formed simultaneously, eliminating the need for an additional photolithography step while maintaining precise dimensional control of the resistor.
Solution Approach 2:
The photolithography process is designed to serve multiple functions: it simultaneously defines the low TCR metal resistor pattern and the top metal plate pattern of the MIM capacitor. This multi-functional approach allows a single process step to accomplish what previously required separate steps, reducing overall fabrication complexity.
2Manufacturing precision
If an extra photolithography step is used to define the low TCR metal resistor, then the resistor structure can be properly formed, but the fabrication time and resource utilization worsen
Solution Approach 1:
The patent merges the resistor definition process with the capacitor top plate definition process into a single photolithography operation. This consolidation reduces the total number of fabrication steps, thereby decreasing manufacturing time and improving overall productivity without compromising the precision of resistor structure formation.
Solution Approach 2:
The mask layer is designed in advance to accommodate both the resistor pattern and the capacitor top plate pattern. By preparing a universal mask design that anticipates both structures, the fabrication process can proceed more efficiently without requiring additional patterning steps, thus improving productivity.
3Manufacturing precision
If an extra photolithography step is used to define the low TCR metal resistor, then the resistor can be accurately formed, but the fabrication cost increases
Solution Approach 1:
The patent combines multiple structure definitions into a single photolithography step, reducing the total number of expensive fabrication operations required. By forming both the low TCR metal resistor and the MIM capacitor top plate in one process step, material and processing costs are reduced while maintaining accurate resistor pattern formation.
Solution Approach 2:
The photolithography process is designed to perform multiple functions simultaneously: defining the resistor pattern, defining the capacitor top plate pattern, and establishing their spatial relationships. This multi-functional approach reduces the total number of process steps required, thereby lowering overall fabrication costs while maintaining manufacturing precision.
Data Source
AI summary
A method of making a semiconductor device, includes: providing a first dielectric layer; sequentially forming a first metal layer, a dummy capacitor dielectric layer, and a second metal layer over the first dielectric layer; and using a single mask layer with two patterns to simultaneously recess two portions of the second metal layer so as to define a metal thin film of a resistor and a top metal plate of a capacitor.