Hall Sensor Doping Profile Optimization for Noise Reduction
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Solution Overview
Problem
Conventional Hall sensors face degradation in sensing ability due to semiconductor substrate defects, leading to noise and increased electricity consumption, as they require high Hall current to maintain sensing capabilities.
Innovation Solution
A Hall sensor design with a predetermined depth maximum doping concentration region in the sensing area, separated from the semiconductor substrate surface, reduces current flow noise and improves sensitivity while minimizing electricity consumption by optimizing the doping profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high Hall current is supplied to maintain sensing ability in conventional Hall sensors, then sensing capability is preserved, but electricity consumption increases
Solution Approach 1:
The patent applies local quality by creating a high concentration doping region at a specific depth (0.5-2.0 μm) within the sensing region, rather than uniform doping throughout. This localized high doping concentration optimizes the electrical properties specifically where the Hall current flows, improving sensing ability while allowing reduced overall current consumption.
Solution Approach 2:
The patent transitions from surface-level doping to depth-based doping by forming the maximum doping concentration region at a predetermined depth below the semiconductor substrate surface. This vertical dimension optimization allows the Hall current to flow through a region with enhanced electrical properties, improving sensing capability without increasing power consumption.
2Ease of manufacture
If conventional doping profile with maximum concentration at surface is used, then manufacturing process is simple, but noise increases due to substrate defects
Solution Approach 1:
The patent moves the maximum doping concentration from the surface (2D) to a specific depth (3D positioning at 0.5-2.0 μm below surface). This depth-based positioning separates the high current flow region from surface defects, reducing noise while maintaining manufacturing feasibility through ion implantation processes.
Solution Approach 2:
The high concentration doping region at intermediate depth acts as an intermediary layer between the surface (with defects) and the bulk substrate. This intermediate region provides a clean, high-mobility path for Hall current flow, isolating the current from surface defects and reducing noise.
3Length of stationary object
If maximum doping concentration is at the semiconductor substrate surface, then current flow path is short, but noise from surface defects disturbs current flow
Solution Approach 1:
The patent positions the maximum doping concentration at a specific depth (0.5-2.0 μm) rather than at the surface, creating an optimized current flow path through the vertical dimension. This depth-based positioning maintains an efficient current path while avoiding surface defects that generate noise.
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 Hall sensor achieves identical sensing ability with reduced electricity consumption by forming a maximum doping concentration region at a specific depth, enhancing noise resistance and Hall voltage sensitivity.
Implementation Method 1
A Hall sensor or a Hall effect sensor is a device that detects a direction and size of a magnetic field by using the Hall effect. The Hall effect is the application of magnetic field to a conductor through which electrical current flows to generate voltage in a direction perpendicular to the electrical current and the magnetic field.
Data Source
AI summary
A Hall sensor with improved doping profile is disclosed. The Hall sensor includes a semiconductor substrate, a sensing region formed on the substrate, an isolation region formed on the sensing region, and a high concentration doping region formed on an upper portion of the sensing region.