Oxide Semiconductor Layout With Dummy Elements for Stable Characteristics
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Solution Overview
Problem
Semiconductor devices using oxide semiconductors face variations in electrical characteristics and shape, leading to element deterioration and instability, particularly due to differences in pattern density and oxygen content across the device, which affects reliability and integration.
Innovation Solution
Incorporating a region with dummy elements between high and low pattern density areas, these elements are formed in the same step and layer as functional elements, using the same material, to stabilize oxygen content and reduce impurity diffusion, thereby minimizing variations and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxide semiconductor elements are manufactured across the substrate, then productivity increases, but variations in electrical characteristics and shape occur due to pattern density differences
Solution Approach 1:
The patent applies local quality by providing dummy elements specifically in regions with low pattern density (edge regions) while maintaining functional elements in high-density regions. This creates spatially varying element density across the substrate, ensuring that each region has appropriate quality characteristics for its intended function, thereby resolving the contradiction between high productivity and manufacturing precision.
Solution Approach 2:
The patent achieves homogeneity by making dummy elements identical in structure and material composition to functional elements. Both element types are formed in the same step using the same oxide semiconductor material, ensuring uniform oxygen content and impurity distribution across the entire substrate, which eliminates variations in electrical characteristics while maintaining high productivity.
2Productivity
If elements are formed in high pattern density regions, then device integration increases, but oxygen content varies and impurity diffusion occurs leading to element deterioration
Solution Approach 1:
The patent uses dummy elements as intermediary structures that mediate between high-density functional regions and low-density edge regions. These dummy elements act as buffer zones that maintain oxygen content stability and prevent impurity diffusion from low-density regions, thereby protecting functional elements from deterioration while enabling high device integration.
Solution Approach 2:
The patent applies beforehand cushioning by pre-positioning dummy elements in low-density regions before device operation begins. These dummy elements serve as protective buffers that preemptively prevent oxygen loss and impurity diffusion from affecting functional elements, ensuring long-term reliability while maintaining high integration density.
3Reliability
If dummy elements are added to stabilize oxygen content, then reliability improves, but device complexity increases
Solution Approach 1:
The patent applies copying by creating dummy elements that are exact replicas of functional elements in terms of structure and material composition. This copying approach allows the dummy elements to provide stabilizing effects without requiring complex or different structures, thereby improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The patent achieves universality by designing dummy elements with the same multi-functional characteristics as functional elements. Both element types serve multiple purposes: electrical function (when active) and oxygen/impurity management (through their presence), which reduces overall device complexity while maintaining high reliability.
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 approach stabilizes electrical characteristics, reduces element deterioration, and improves the reliability and productivity of semiconductor devices by controlling oxygen distribution and impurity absorption, allowing for high integration and miniaturization while maintaining low power consumption.
Implementation Method 1
stabilize oxygen content and reduce impurity diffusion
Implementation Method 2
stabilize oxygen content and reduce impurity diffusion
Data Source
AI summary
A semiconductor device in which variations in characteristics, deterioration of elements, and abnormality in shape are inhibited is provided. The semiconductor device includes a first region including a plurality of elements and a second region including a plurality of dummy elements. The second region is provided in an outer edge of the first region, and the element and the dummy element each include an oxide semiconductor. The element and the dummy element have the same structure, and a structure body included in the element and a structure body included in the dummy element are formed with the same material and provided in the same layer. The oxide semiconductor includes In, an element M (M is Al, Ga, Y, or Sn), and Zn.