Oxide Semiconductor Current Blocking Structure for High Withstand Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor devices face challenges in achieving excellent withstand voltage performance and responsiveness, particularly in power devices where high-resistance layers and doping concentrations are not adequately addressed.
Innovation Solution
A semiconductor device is designed with a crystalline oxide semiconductor layer including a channel layer, a drift layer, and a source region, featuring a high-resistance current blocking region between the channel and drift layers, and a source electrode forming a contact with the current blocking region, utilizing materials like gallium oxide and dopants to enhance electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-resistance layer is introduced to improve withstand voltage performance, then voltage blocking capability is enhanced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the high-resistance layer formation with the drift layer by introducing a gradient doping structure where the drift layer itself serves as the high-resistance region through controlled dopant concentration distribution. This merging eliminates the need for a separate high-resistance layer while achieving the same voltage blocking function, thereby reducing device complexity and manufacturing steps.
Solution Approach 2:
The patent applies local quality by creating a gradient dopant concentration within the drift layer, where the dopant concentration varies spatially to provide different resistance levels in different regions. This allows the drift layer to simultaneously serve as both the high-resistance blocking region and the functional drift region, optimizing both withstand voltage performance and device simplicity.
2Reliability
If dopant concentration is increased to improve electrical properties, then conductivity is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes by implementing a gradient dopant concentration profile instead of uniform doping. The dopant concentration is varied continuously or in steps across the drift layer thickness, allowing optimization of electrical properties at different depths while providing a more tolerant manufacturing process that does not require extremely precise uniform doping control.
Solution Approach 2:
The patent applies partial action by doping only specific regions of the semiconductor structure with optimized dopant concentrations, rather than uniformly doping the entire structure. The gradient doping is applied selectively in the drift layer region where it is most needed for electrical property optimization, reducing overall manufacturing complexity and precision requirements.
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 semiconductor device achieves improved withstand voltage performance and responsiveness by optimizing the current blocking region's electron trap density and dopant concentration, leading to enhanced reliability and efficiency in power applications.
Implementation Method 1
the current blocking region being composed of a high-resistance layer
Implementation Method 2
the source electrode forming a contact with the current blocking region
Data Source
AI summary
Provided a semiconductor device includes at least: a crystalline oxide semiconductor layer including a channel layer, a drift layer, and a source region; a gate electrode arranged over the channel layer across a gate insulating film; a current blocking region arranged between the channel layer and the drift layer; and a source electrode provided on the source region. The current blocking region is composed of a high-resistance layer. The source electrode forms a contact with the current blocking region.