Layered Silicon Nitride Insulator for Semiconductor Breakdown Voltage
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Solution Overview
Problem
Semiconductor devices face challenges in achieving high reliability due to issues with electrical resistance, moisture permeability, and metal diffusion, which affect breakdown voltage and electrical characteristics.
Innovation Solution
A semiconductor device structure incorporating a first layer with varying silicon nitride compositions, including regions with different silicon-to-nitrogen ratios, is used to enhance electrical resistance, reduce moisture permeability, and suppress metal reactions, thereby increasing breakdown voltage and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicon nitride layer is used to increase breakdown voltage, then electrical resistance increases, but moisture permeability may worsen
Solution Approach 1:
The patent applies local quality by creating a multi-layer structure where different portions of the silicon nitride layer have different silicon concentrations. The first portion has a first silicon concentration optimized for electrical resistance and breakdown voltage, while the second portion has a second silicon concentration optimized for moisture barrier properties. This allows each layer to perform its specific function optimally without compromising the other.
2Reliability
If metal layers are used to improve electrical conductivity, then electrical characteristics improve, but metal diffusion and reactions may occur
Solution Approach 1:
The patent uses the silicon nitride layer as an intermediary barrier between metal layers and the semiconductor substrate. This intermediate layer prevents direct contact and diffusion between metal atoms and the substrate, while still allowing for proper electrical characteristics through controlled conductivity. The layer acts as a diffusion barrier that mediates the interaction between metal and semiconductor materials.
3Device complexity
If a single-layer silicon nitride structure is used to simplify manufacturing, then device complexity decreases, but control over electrical resistance and moisture permeability is insufficient
Solution Approach 1:
The patent segments the silicon nitride layer into multiple portions with different silicon concentrations. Instead of using a single uniform layer, the structure is divided into a first portion and a second portion, each with optimized properties. This segmentation allows independent optimization of electrical resistance and moisture permeability characteristics while maintaining manufacturability through sequential deposition processes.
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 device achieves increased breakdown voltage and reliability by controlling electrical resistance and moisture interactions through the layered silicon nitride structure, preventing electrical disconnections and fluctuations in semiconductor characteristics.
Implementation Method 1
enhance electrical resistance, reduce moisture permeability, and suppress metal reactions, thereby increasing breakdown voltage and reliability
Implementation Method 2
enhance electrical resistance, reduce moisture permeability, and suppress metal reactions
Data Source
AI summary
According to one embodiment, a semiconductor device includes a first electrode, a first semiconductor region of a first conductivity type, a second semiconductor region of a second conductivity type, a second electrode, and a first layer. The first layer includes at least one selected from the group consisting of silicon nitride, silicon oxide, and silicon oxynitride. The first layer includes a first portion, a second portion, and a third portion. The first portion is provided on the second electrode. The second portion is provided on the first portion. A content of silicon of the second portion is higher than a content of silicon of the first portion. A third portion is provided on the second portion. A content of silicon of the third portion is lower than the content of silicon of the second portion.