Integrated Circuit Capacitor Resistor Shared Material Formation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current integrated circuit manufacturing processes are costly due to the numerous patterning and etching steps required for forming metal-to-metal capacitors and resistors, with most capacitors needing at least two to three additional patterning steps and resistors requiring deposition and patterning steps, leading to increased manufacturing costs.
Innovation Solution
A process where the bottom plate of a metal-to-metal capacitor and a metallic device, such as a resistor, are formed using the same material layers, reducing the number of photoresist patterning steps and eliminating the need for additional deposition and etching steps, with a high resistance conductive etch stop layer ensuring uniformity across the wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metal-to-metal capacitors and resistors are formed using conventional separate patterning steps, then device functionality is achieved, but manufacturing cost increases and processing time extends
Solution Approach 1:
The patent merges the formation of capacitor bottom plates and resistor structures into a single patterning step. The resistive material layer is patterned simultaneously to form both capacitor bottom plates and resistor structures, eliminating separate patterning steps and reducing manufacturing complexity while maintaining device functionality
Solution Approach 2:
The resistive material layer serves multiple functions: it forms the bottom plate of metal-to-metal capacitors and simultaneously forms resistor structures. This multi-functional approach allows a single material layer and patterning process to create both device types, reducing the overall number of fabrication steps required
2Productivity
If additional deposition and etching steps are performed for resistors, then resistor functionality is achieved, but processing time and cost increase
Solution Approach 1:
The resistive material layer is deposited in advance as part of the capacitor bottom plate formation process. This preliminary deposition allows the same material layer to be used for both capacitor and resistor formation, eliminating the need for separate resistor material deposition steps and reducing overall processing time
3Manufacturing precision
If wafer-level uniformity is required for resistance, then precise control is needed, but process complexity increases
Solution Approach 1:
The etch stop layer automatically provides wafer-level uniformity control through its inherent material properties. The layer's consistent thickness and etch characteristics self-regulate the resistive material layer thickness across the entire wafer during the patterning process, eliminating the need for additional control mechanisms or complex process adjustments
Data Source
AI summary
An integrated circuit structure with a metal-to-metal capacitor and a metallic device such as a resistor, effuse, or local interconnect where the bottom plate of the capacitor and the metallic device are formed with the same material layers. A process for forming a metallic device along with a metal-to-metal capacitor with no additional manufacturing steps.