Oxide Semiconductor Charge Mobility via Electronegativity Design
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Solution Overview
Problem
Current thin film transistors using amorphous silicon have low charge mobility, while those using polysilicon have high manufacturing costs and low uniformity, limiting the production of high-performance thin film transistor array panels.
Innovation Solution
An oxide semiconductor is developed by adding a second material to a first material, such as zinc or tin, based on specific electronegativity and ionic radius differences, to improve the characteristics of the thin film transistor, including a gate electrode, source electrode, and drain electrode configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amorphous silicon is used as the semiconductor material, then the manufacturing cost is low and uniformity is good, but the charge mobility is low which limits high performance thin film transistor manufacturing
Solution Approach 1:
The patent uses composite oxide semiconductor materials (such as In-Ga-Zn-O, In-Al-Zn-O, In-Sn-Zn-O systems) combining multiple metal elements with specific atomic ratios to achieve high charge mobility while maintaining manufacturing feasibility. The composite structure allows synergistic effects of different elements to overcome the limitations of single-material systems.
Solution Approach 2:
The patent systematically varies composition parameters (atomic ratios of In, Ga, Zn, O), structural parameters (crystalline vs. amorphous phases), and processing parameters (deposition temperatures, oxygen partial pressures) to optimize charge mobility. By changing these parameters, the material achieves high performance without requiring complex manufacturing processes.
2Reliability
If polysilicon is used as the semiconductor material, then the charge mobility is high enabling high performance thin film transistor manufacturing, but the manufacturing cost is high and uniformity is low which limits large-sized panel production
Solution Approach 1:
The patent employs composite oxide semiconductors with multiple metal elements in specific ratios to achieve charge mobility comparable to or exceeding polysilicon, while the amorphous or nanocrystalline structure of these composites enables better uniformity across large areas without requiring the complex crystallization processes needed for polysilicon.
Solution Approach 2:
The patent replaces expensive polysilicon materials and complex crystallization processing with relatively inexpensive oxide semiconductor materials and simpler deposition processes, achieving comparable or superior performance at lower cost with better scalability to large panels.
3Reliability
If conventional methods are used to determine added materials to oxide semiconductors, then samples are manufactured and characteristics are verified, but the process is inefficient since it is performed without a theoretical base in the periodic table
Solution Approach 1:
The patent performs preliminary theoretical analysis using periodic table properties (electronegativity, ionic radius, oxidation states) to pre-screen and select suitable candidate elements before actual material synthesis. This preliminary selection based on fundamental chemical principles significantly reduces the number of experimental trials needed and accelerates the material development process.
Solution Approach 2:
The patent systematically adjusts composition parameters (atomic ratios, doping concentrations) and processing parameters (deposition conditions, annealing temperatures) based on theoretical predictions to optimize material characteristics, reducing the need for extensive trial-and-error experimentation.
Data Source
AI summary
An oxide semiconductor includes a first material including at least one selected from the group consisting of zinc (Zn) and tin (Sn), and a second material, where a value acquired by subtracting an electronegativity difference value between the second material and oxygen (O) from the electronegativity difference value between the first material and oxygen (O) is less than about 1.3.