Hall Sensor Blocking Layer for Higher Sensitivity and Isolation
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Solution Overview
Problem
Existing Hall elements often have complex structures or low performance parameters, failing to meet the requirements for high sensitivity applications.
Innovation Solution
A Hall element design featuring a substrate, Hall-sensing layer, electrodes, blocking layer, and conductor pad, where applying potential to the blocking layer through the conductor pad creates a depletion layer to limit current flow and reduce the Hall-sensing layer thickness, enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a blocking layer is added to cover the Hall-sensing layer, then the sensitivity is improved by creating a depletion layer and reducing the Hall-sensing layer thickness, but the device structure becomes more complex
Solution Approach 1:
The device is segmented into distinct functional layers: the Hall-sensing layer for detecting magnetic fields, the blocking layer for creating depletion regions and limiting current flow, and the conductor pad for electrical connection. This segmentation allows each layer to perform its specific function optimally while maintaining overall device organization.
Solution Approach 2:
The blocking layer changes the electrical parameters of the device by creating depletion regions that modify current flow characteristics. By controlling the thickness and doping of the blocking layer, the depletion layer width is adjusted to optimize sensitivity while managing the added structural complexity.
2Measurement precision
If the Hall-sensing layer thickness is reduced to increase Hall voltage, then sensitivity is improved, but the current flow control becomes more difficult
Solution Approach 1:
The blocking layer acts as an intermediary between the Hall-sensing layer and the external circuit. It mediates current flow by creating depletion regions that control and limit current paths, enabling precise current management even when the Hall-sensing layer is made thin to maximize Hall voltage.
Solution Approach 2:
The blocking layer introduces local quality variations by creating depletion regions with different electrical properties. These localized changes in electrical characteristics allow precise control of current flow in specific areas while maintaining the overall thin structure of the Hall-sensing layer.
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 design increases the induced Hall voltage value, improving sensitivity while maintaining effective isolation, and can be fabricated using a standard CMOS process.
Implementation Method 1
applying a potential to the blocking layer covering the Hall sensing layer... creates a depletion layer of a sufficient width to limit the current flow direction
Implementation Method 2
since the Hall sensors use the electromagnetic effect for non-contact measurement
Implementation Method 3
The conductor pad is disposed on a side of the blocking layer facing away from Hall-sensing layer and configured to be grounded or connected to a predetermined voltage
Data Source
AI summary
Provided is a Hall element. The Hall element includes a substrate, a Hall-sensing layer disposed on the substrate, electrodes, a blocking layer, and a conductor pad. The electrodes are connected to the Hall-sensing layer. The blocking layer is disposed on a side of the Hall-sensing layer facing away from the substrate and covers the Hall-sensing layer. The conductor pad is disposed on a side of the blocking layer facing away from Hall-sensing layer and configured to be grounded or connected to a predetermined voltage. Applying a potential to the blocking layer covering the Hall sensing layer through the conductor pad not only creates a depletion layer of a sufficient width to limit the current flow direction, thereby producing an effective isolation effect, but also reduces the thickness of the Hall-sensing layer to increase the value of an induced Hall voltage, thereby enhancing the sensitivity of the Hall element.