Semiconductor Diode Structure for ESD Protection
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Solution Overview
Problem
Semiconductor devices face damage from electrostatic discharge and high current densities during switching events, with existing protection methods increasing power consumption and process complexity.
Innovation Solution
A semiconductor device design incorporating a diode structure between the gate and source electrode, with an insulating layer and shielding doping regions to reduce interaction with the semiconductor substrate, preventing parasitic transistor activation and enhancing charge carrier discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection methods are implemented for semiconductor devices, then reliability is improved, but power consumption increases and switching time is prolonged
Solution Approach 1:
An insulating layer is introduced as an intermediary between the diode structure and the semiconductor substrate. This mediator prevents direct interaction and parasitic transistor activation while maintaining the protective function of the diode, thereby reducing power consumption without compromising reliability
Solution Approach 2:
The patent applies different doping characteristics to different regions of the shielding doping region. A first portion has a first doping characteristic while a second portion has a second doping characteristic, allowing optimized local properties for both protection and power efficiency
2Reliability
If protection methods are implemented for semiconductor devices, then reliability is improved, but switching time is prolonged
Solution Approach 1:
The patent implements spatially varying doping characteristics within the shielding doping region. The first portion has a first doping characteristic and the second portion has a second doping characteristic, enabling different regions to perform specialized functions that optimize both protection and switching speed
Solution Approach 2:
The patent extends the shielding doping region vertically into the semiconductor substrate, creating a three-dimensional protection structure. This vertical dimension allows for optimized charge carrier management and reduced switching time while maintaining protection against high current densities
3Reliability
If diode structure is coupled close to transistor arrangement, then protection effectiveness is improved, but parasitic transistor activation occurs
Solution Approach 1:
The insulating layer serves as a mediator positioned between the diode structure and the semiconductor substrate. This intermediary physically separates the two components, preventing charge carrier injection into the substrate and eliminating parasitic transistor activation while maintaining close coupling for effective protection
Solution Approach 2:
The patent extracts the harmful interaction mechanism by removing the direct contact interface between the diode structure and semiconductor substrate. The insulating layer eliminates the charge carrier injection path that would otherwise activate parasitic transistors
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 improves the reliability and durability of semiconductor devices by reducing power consumption and switching time while preventing damage from electrostatic discharges and high current densities.
Implementation Method 1
An insulating layer is located vertically between the diode structure and a front side surface of a semiconductor substrate
Implementation Method 2
A substrate pn-junction extends from the front side surface of the semiconductor substrate into the semiconductor substrate between a shielding doping region and an edge doping portion
Implementation Method 3
A depletion boundary between a non-depletable doping portion of a shielding doping region and a depletable doping portion of the shielding doping region extends from the front side surface into the semiconductor substrate
Data Source
AI summary
A semiconductor device includes a transistor arrangement and a diode structure. The diode structure is coupled between a gate electrode structure of the transistor arrangement and a source electrode structure of the transistor arrangement. An insulating layer is located vertically between the diode structure and a front side surface of a semiconductor substrate of the semiconductor device. The diode structure includes at least one diode pn-junction. A substrate pn-junction extends from the front side surface of the semiconductor substrate into the semiconductor substrate between a shielding doping region and an edge doping portion. The edge doping portion is located adjacent to the shielding doping region within the semiconductor substrate. At the front side surface of the semiconductor substrate, the substrate pn-junction is located laterally between the diode pn-junction and a source contact region of the diode structure with the source electrode structure.