Hall Effect Device Doping Profile Optimization
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Solution Overview
Problem
Hall effect devices suffer from offset voltage and low signal-to-noise ratio due to their magnetic sensitivity and doping profiles, which affect their performance in sensing magnetic fields.
Innovation Solution
A method for doping the active Hall effect region of a semiconductor substrate using multiple implantation steps with different energy levels to create optimized doping profiles, achieving a low average doping level combined with low sheet resistance, thereby enhancing magnetic sensitivity and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single doping profile is used in the active Hall effect region, then the manufacturing process is simple, but the magnetic sensitivity and signal-to-noise ratio are reduced
Solution Approach 1:
The doping process is segmented into multiple implantation steps, each creating a distinct doping profile at different depth regions. The first implantation creates a doping profile in a first depth region, the second implantation creates a doping profile in a second depth region, and subsequent implantations create additional profiles. This segmentation allows optimization of magnetic sensitivity through controlled doping distribution while managing process complexity through systematic multi-step fabrication
Solution Approach 2:
Different doping profiles are created at different depth regions within the active Hall effect region. Each implantation step targets specific depth regions with appropriate doping concentrations and energy levels, creating locally optimized doping characteristics that enhance overall magnetic sensitivity and signal-to-noise ratio while maintaining manufacturability
2Reliability
If high doping concentration is used, then sheet resistance is reduced, but noise increases and magnetic sensitivity decreases
Solution Approach 1:
The doping concentration is varied as a function of depth within the active Hall effect region. By controlling the implantation energy and dose for each step, the patent creates an optimized doping profile where doping concentration changes with depth, achieving low sheet resistance through integrated doping control while maintaining low noise and high magnetic sensitivity through reduced peak doping concentrations compared to uniform high-doping approaches
3Manufacturing precision
If multiple implantation steps with different energy levels are used, then doping profile optimization is achieved, but manufacturing complexity increases
Solution Approach 1:
The implantation process is divided into multiple discrete steps, each with specific energy levels and dose parameters tailored to create doping profiles in different depth regions. This segmentation enables precise control over the final doping profile shape and concentration distribution, achieving high manufacturing precision for the active Hall effect region while organizing process complexity into manageable, repeatable steps
Solution Approach 2:
Subsequent implantation steps are performed after earlier implantation steps have established initial doping profiles. Each later implantation builds upon and modifies the doping structure created by previous steps, allowing progressive optimization of the doping profile with controlled precision while managing overall process complexity through sequential fabrication
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
The approach improves the magnetic sensitivity, signal-to-noise ratio, and breakdown voltage of Hall effect devices by creating a homogeneous doping distribution, reducing noise effects, and optimizing electrical characteristics.
Implementation Method 1
forming a first doping profile of a first doping type in a first depth region of the active Hall effect region by means of a first implantation with a first implantation energy level, forming a second doping profile of the first doping type in a second depth region of the active Hall effect region by means of a second implantation with a second implantation energy level
Implementation Method 2
forming an overall doping profile of the active Hall effect region by annealing the semiconductor substrate with the active Hall effect region having the first and second doping profile
Implementation Method 3
forming an overall doping profile of the active Hall effect region by annealing the semiconductor substrate with the active Hall effect region having the first and second doping profile
Data Source
AI summary
Methods for doping an active Hall effect region of a Hall effect device in a semiconductor substrate, and Hall effect devices having a doped active Hall effect region are provided. A method includes forming a first doping profile of a first doping type in a first depth region of the active Hall effect region by means of a first implantation with a first implantation energy level, forming a second doping profile of the first doping type in a second depth region of the active Hall effect region by means of a second implantation with a second implantation energy level, and forming an overall doping profile of the active Hall effect region by annealing the semiconductor substrate with the active Hall effect region having the first and the second doping profile.