Gate Dielectric Recovery for Low-Flicker Analog CMOS
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Solution Overview
Problem
As the minimum feature size in semiconductor devices is reduced, issues such as increased flicker noise in analog devices arise, which affects the integration density and performance of electronic components.
Innovation Solution
The treatment of a gate dielectric layer in analog devices using a plasma process followed by an annealing process to form a recovered region, which reduces flicker noise without requiring additional masks or significantly altering existing CMOS processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the minimum feature size is reduced to increase integration density, then more components can be integrated into a given area, but flicker noise in analog devices increases
Solution Approach 1:
The patent applies different treatments to different regions of the gate dielectric layer. Specifically, the analog region undergoes plasma treatment and annealing to form a recovered region with reduced flicker noise, while the digital region maintains its standard structure. This local differentiation allows high integration density across the chip while specifically addressing flicker noise in analog devices through targeted modification of the gate dielectric properties in the analog region only.
Solution Approach 2:
The patent modifies physical and chemical parameters of the gate dielectric layer through plasma treatment and thermal annealing. The plasma treatment introduces defects and the subsequent annealing process recovers these defects, changing the dielectric's electrical properties. This parameter change reduces trap density and interface states in the analog region, thereby reducing flicker noise while maintaining the scaled feature sizes needed for high integration density.
2Object-generated harmful factors
If additional processes are added to reduce flicker noise, then analog device performance improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the flicker noise reduction process with existing CMOS manufacturing steps. The plasma treatment and annealing are integrated into the standard process flow, utilizing existing plasma equipment and annealing furnaces already present in CMOS fabrication lines. By merging these additional processes with existing infrastructure rather than introducing completely new equipment or process modules, the manufacturing complexity and cost increase is minimized while still achieving flicker noise reduction.
Solution Approach 2:
The patent performs plasma treatment and annealing at specific stages in the manufacturing process, before final device assembly and testing. By conducting these treatments preliminarily during the standard fabrication sequence, the process leverages existing process windows and equipment capabilities without requiring additional dedicated process modules. This timing strategy reduces overall manufacturing complexity by integrating noise reduction into the existing process flow rather than adding separate post-processing steps.
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 reduces flicker noise in analog devices, improving their performance and signal-to-noise ratio, while maintaining compatibility with standard CMOS processes and avoiding increased costs.
Implementation Method 1
The treatment of a gate dielectric layer in analog devices using a plasma process
Implementation Method 2
followed by an annealing process to form a recovered region
Data Source
AI summary
Semiconductor devices and methods of manufacturing are presented wherein a gate dielectric is treated within an analog region of a semiconductor substrate. The gate dielectric may be treated with a plasma exposure and/or an annealing process in order to form a recovered region of the gate dielectric. A separate gate dielectric is formed within a logic region of the semiconductor substrate, and a first gate electrode and second gate electrode are formed over the gate dielectrics.