Semiconductor Drift Region Layout for Dielectric Damage Isolation
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Solution Overview
Problem
In semiconductor devices like MOSFETs, severe hot carriers can degrade reliability, induce high leakage current, or cause malfunction, necessitating a solution to address these issues.
Innovation Solution
A method for manufacturing semiconductor devices involves forming a trench in a semiconductor layer, depositing a dielectric layer to fill the trench, and creating an anti-type doping layer beneath the dielectric layer. This anti-type doping layer has a conductivity type opposite to that of the drift region, effectively changing the current path and reducing the influence of dielectric damages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a dielectric layer is deposited to fill the trench in the semiconductor device, then the structural integrity and insulation are improved, but dielectric damages occur that influence the current path and degrade reliability
Solution Approach 1:
An anti-type doping layer is introduced as an intermediary between the drift region and the dielectric layer. This intermediate layer serves as a mediator that redirects the current path away from the dielectric-damaged region, thereby preventing the dielectric damages from directly influencing the current flow while maintaining the structural integrity provided by the dielectric layer.
Solution Approach 2:
The semiconductor structure is segmented into distinct functional regions: the drift region, the anti-type doping layer, and the dielectric layer. By segmenting the current path through the anti-type doping layer, the design isolates the dielectric layer's structural support function from its harmful electrical influence, allowing the current to flow through the anti-type doping layer instead of being affected by dielectric damages.
2Device complexity
If the current path flows directly through the drift region adjacent to the dielectric film, then the device operation is simplified, but severe hot carriers are generated that degrade reliability and induce high leakage current
Solution Approach 1:
The anti-type doping layer acts as an intermediary between the drift region and the dielectric film, modifying the current path to flow through this intermediate layer. This redirection reduces the generation of severe hot carriers in the drift region while maintaining relatively simple device operation through the added doping layer.
Solution Approach 2:
Instead of allowing the current to flow directly through the drift region as in conventional designs, the invention inverts the current path by introducing the anti-type doping layer that forces the current to flow through a different path, thereby reducing hot carrier generation and improving reliability without significantly increasing device complexity.
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 implementation of the anti-type doping layer between the drift region and the dielectric film reduces the impact of dielectric damages on the current path, leading to improved operation performance and reliability of the semiconductor device.
Implementation Method 1
the anti-type doping layer has a conductivity type opposite to that of the drift region so as to change a current path of a current in the drift region
Data Source
AI summary
A semiconductor device includes a drift region, a dielectric film, and an anti-type doping layer. The drift region has a first type conductivity. The anti-type doping layer is located between the drift region and the dielectric film, and has a second type conductivity opposite to the first type conductivity so as to change a current path of a current in the drift region, to thereby prevent the current from being influenced by the dielectric film. A method for manufacturing a semiconductor device and a method for reducing an influence of a dielectric film are also disclosed.