Amorphous Channel Control Layer for Power Semiconductor Drift Zone
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Solution Overview
Problem
Power semiconductor components face challenges in reducing specific on-resistance (RDSon) while maintaining high blocking voltage capability, as existing methods such as compensation zones and field electrodes have limitations in optimizing the drift zone's electrical resistance.
Innovation Solution
Incorporating a channel control layer made of amorphous semi-insulating material adjacent to the drift zone, which is adapted to the doping type and concentration of the drift zone to develop inversion or accumulation channels, thereby reducing the electrical resistance of the drift zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensation zones or field electrodes are used to reduce on-resistance, then the electrical resistance of the drift zone is reduced, but the blocking voltage capability is compromised
Solution Approach 1:
A channel control layer made of amorphous semi-insulating material is introduced as an intermediary element between the gate electrode and the drift zone. This layer mediates the formation of inversion or accumulation channels that reduce drift zone resistance without compromising the blocking voltage capability, as it provides a controlled interface for channel formation while maintaining the drift zone's inherent blocking properties.
Solution Approach 2:
The invention changes the physical and chemical parameters of the interface between the gate control structure and the drift zone by introducing an amorphous semi-insulating layer with specific work function and doping characteristics. This parameter change enables optimized channel formation (inversion or accumulation) that reduces on-resistance while preserving blocking voltage capability through controlled carrier concentration at the interface.
2Object-affected harmful factors
If the drift zone is optimized for low on-resistance, then the specific on-resistance RDSon·A is reduced, but the blocking voltage capability deteriorates
Solution Approach 1:
The channel control layer introduces local quality variations at the interface between the gate control structure and the drift zone. By creating localized inversion or accumulation channels only in specific regions where the amorphous layer contacts the drift zone, the invention reduces on-resistance locally without affecting the overall blocking voltage capability of the drift zone, which maintains its bulk properties for voltage blocking.
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 the electrical resistance of the drift zone, enhancing the power semiconductor component's performance by optimizing the channel formation and space charge zone propagation, leading to improved on-resistance and blocking voltage capabilities.
Implementation Method 1
The work function of the amorphous material of the channel control zone is adapted to the doping type and the doping concentration of the drift zone such that an inversion channel develops in the drift zone along the interface between the drift zone and the channel control zone
Implementation Method 2
an accumulation channel develops in the drift zone along the interface between the drift zone and the channel control zone
Data Source
AI summary
Disclosed is a semiconductor component, including: a drift zone arranged between a first and a second connection zone; a channel control layer of an amorphous semi-insulating material arranged adjacent to the drift zone.