Poly-Silicon Resistor Resistance via Dopant Out-Diffusion
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Solution Overview
Problem
Integrated circuit systems face challenges in achieving high resistance values for resistors without degrading transistor performance, as existing methods require additional process steps that can negatively impact poly-depletion effects and transistor performance.
Innovation Solution
The integration of strategically engineered dielectric layers that block low resistance electrical contacts and promote dopant out-diffusion from resistors, potentially combined with hydrogen doping, to enhance resistance values without degrading transistor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional process steps are used to alter resistor resistivity, then resistance value is improved, but transistor performance is degraded
Solution Approach 1:
The patent segments the processing into two distinct sequences: first forming the transistor gate structures with their required dopant profiles, then subsequently forming the resistor regions from the same poly-silicon layer. This temporal and spatial segmentation allows each component to be optimized independently without mutual interference, resolving the contradiction between achieving precise resistor resistivity and maintaining transistor performance.
Solution Approach 2:
The patent applies preliminary action by first forming the transistor gate structures and establishing their dopant profiles before proceeding to resistor formation. This preliminary sequencing ensures that transistor-critical regions are established with optimal properties first, and subsequent resistor processing steps do not degrade these previously established transistor characteristics.
2Productivity
If concurrent formation of resistors and gate structures is used, then manufacturing efficiency is improved, but additional process steps are required
Solution Approach 1:
The patent merges the formation of resistors and gate structures by using the same poly-silicon layer for both purposes. This consolidation eliminates the need for separate resistor material deposition and patterning steps, thereby improving manufacturing efficiency while managing process complexity through a unified material system.
Solution Approach 2:
The patent applies local quality by creating region-specific dopant profiles within the unified poly-silicon layer. Through selective implantation or diffusion processes, different areas of the poly-silicon layer acquire tailored dopant concentrations - high dopant levels in gate regions for optimal transistor performance, and controlled dopant levels in resistor regions for precise resistance values - thus achieving both manufacturing efficiency and component-specific optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively increases resistor resistance by 40-70% without additional process steps, while maintaining or improving transistor performance through stress memorization and hydrogen management.
Implementation Method 1
annealing the integrated circuit system to remove dopant from the resistance device
Implementation Method 2
combined with hydrogen doping, to enhance resistance values
Implementation Method 3
annealing the integrated circuit system to remove dopant from the resistance device
Data Source
AI summary
An integrated circuit system that includes: providing a substrate including a first region and a second region; forming a first device over the first region and a resistance device over the second region; forming a first dielectric layer and a second dielectric layer over the substrate; removing a portion of the second dielectric layer; and annealing the integrated circuit system to remove dopant from the resistance device.