Semiconductor Device Minority Charge Carrier Injector Zones
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Solution Overview
Problem
Semiconductor devices experience dynamic avalanche and punch-through effects at high cut-off voltages, leading to destructive avalanche current densities and electromagnetic compatibility issues, particularly above 70 volts, which can damage the device and degrade EMC characteristics.
Innovation Solution
Incorporating minority charge carrier injector zones with complementary conduction between highly doped semiconductor zones and drift zones, allowing for controlled avalanche breakdown and reduced switching losses by adjusting the geometry and doping of these zones to manage electrical field steepening and current densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-resistance pedestal zone with low doping is inserted between drift zone and second highly doped semiconductor zone to avoid current interruption, then the EMC characteristic is improved, but the resistive conducting-state losses increase
Solution Approach 1:
The patent optimizes the doping concentration and thickness parameters of the pedestal zone to achieve a balance between preventing current interruption and minimizing resistive losses. By carefully selecting specific doping levels and geometric dimensions, the device maintains good EMC characteristics while reducing the negative impact on conducting-state losses.
2Device complexity
If the background doping is increased to avoid flooding of the low-doped region, then the device structure is simplified, but the reverse current breaks off severely during cutting-off
Solution Approach 1:
The patent employs different doping levels in different regions of the semiconductor device. The pedestal zone has a specific doping concentration that is higher than the drift zone but lower than the highly doped contact zones. This local differentiation allows the device to prevent severe reverse current interruption while maintaining a manageable structural complexity.
3Productivity
If the drift zone is made thinner to reduce switching losses, then the switching speed is improved, but the dynamic avalanche and punch-through effects become more severe
Solution Approach 1:
The pedestal zone acts as an intermediary region between the drift zone and the highly doped semiconductor zone. This intermediate structure helps to gradually transition the electric field distribution, thereby mitigating the severity of dynamic avalanche and punch-through effects even when the drift zone is made thinner for faster switching.
4Adaptability or versatility
If control electrodes are added to control body zones for improving device functionality, then the versatility is improved, but the device complexity increases
Solution Approach 1:
The control electrodes are designed to perform multiple functions: they control the body zones for device operation, help manage electric field distribution to mitigate avalanche effects, and contribute to overall device performance optimization. This multi-functionality reduces the need for separate dedicated structures for each function.
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 solution effectively reduces the risk of premature breakdowns, improves the ruggedness of semiconductor devices, and maintains EMC characteristics by selectively controlling avalanche and punch-through effects, thereby enhancing the switching performance and reliability of semiconductor devices.
Implementation Method 1
a dynamic avalanche effect or also a dynamic punch-through effect may occur at the main pn junction between body zone and drift zone
Implementation Method 2
In addition, the body zones have minority charge carrier injector zones with complementary conduction to the body zones, arranged between the first semiconductor zones and the drift zone
Implementation Method 3
control electrodes which are insulated from the semiconductor body by a gate oxide and act on the body zones for controlling the semiconductor device
Implementation Method 4
first electrodes which contact first highly doped semiconductor zones and complementary-conduction body zones
Data Source
AI summary
A semiconductor device with a semiconductor body and to a method for producing it. In one embodiment, the semiconductor body has first electrodes which contact first highly doped semiconductor zones and complementary-conduction body zones surrounding the first semiconductor zones. The semiconductor body has a second electrode which contacts a second highly doped semiconductor zone. Between the second semiconductor zone and the body zones, a drift zone is arranged. Control electrodes which are insulated from the semiconductor body by a gate oxide and act on the body zones for controlling the semiconductor device are arranged on the semiconductor body. The body zones have minority charge carrier injector zones with complementary conduction to the body zones, arranged between the first semiconductor zones and the drift zone.