SiC Semiconductor Device Dual Dopant Reliability
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Solution Overview
Problem
The reliability of silicon carbide (SiC) semiconductor devices is compromised due to degradation mechanisms during operation, particularly through charge carrier injection and recombination, which leads to stacking faults that impede charge transport and affect forward voltage and resistance.
Innovation Solution
A semiconductor device with a SiC semiconductor body featuring a first semiconductor region of one conductivity type and a second semiconductor region of another conductivity type, arranged vertically, utilizing a combination of dopant species with different energy levels to reduce charge carrier injection and enhance recombination, thereby improving device reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional doping methods are used in SiC semiconductor devices, then manufacturing is simpler, but charge carrier injection and recombination cause stacking faults that reduce reliability
Solution Approach 1:
The first semiconductor region is divided into multiple doping zones with different dopant species and concentrations. The doping profile is segmented into distinct regions (first doping region with first dopant species, second doping region with second dopant species) to control charge carrier injection and recombination at different depths, thereby reducing stacking faults while maintaining manageable manufacturing complexity
Solution Approach 2:
Different dopant species and concentrations are applied to different regions within the first semiconductor region. The doping characteristics are locally optimized - higher dopant concentration near the pn junction to control injection, and varying concentration profiles at different depths to manage recombination, thereby improving reliability without uniform complexity throughout the structure
2Reliability
If dual dopant species are used to reduce charge carrier injection, then reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The doping profile is designed and established during the manufacturing process with predetermined dopant species and concentration distributions. The first and second doping regions are created with specific profiles before device operation, pre-configuring the charge carrier injection and recombination characteristics to ensure reliability while maintaining achievable manufacturing precision
Solution Approach 2:
The doping strategy involves changing multiple parameters - dopant species type, concentration levels, and spatial distribution - to optimize reliability. By carefully selecting and controlling these parameters within achievable manufacturing tolerances, the patent achieves improved reliability without requiring excessive precision that would be difficult to manufacture
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 use of dual dopant species with distinct energy levels reduces charge carrier injection into the second semiconductor region, minimizing degradation from recombination-induced stacking faults, thus enhancing the reliability and performance of SiC semiconductor devices.
Implementation Method 1
The first semiconductor region has a first dopant species and a second dopant species... reduce charge carrier injection into the second semiconductor region, minimizing degradation from recombination-induced stacking faults
Implementation Method 2
The first semiconductor region has a first dopant species and a second dopant species with different energy levels
Data Source
AI summary
The disclosure relates to a semiconductor device having a SiC semiconductor body. The SiC semiconductor body includes a first semiconductor region of a first conductivity type and a second semiconductor region of a second conductivity type. The first semiconductor region is electrically contacted at a first surface of the SiC semiconductor body and forms a pn junction with the second semiconductor region. The first semiconductor region and the second semiconductor region are arranged one above the other in a vertical direction perpendicular to the first surface. The first semiconductor region has a first dopant species and a second dopant species.