Oxide Thin Film Solution Composition for High Mobility Transistors
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Solution Overview
Problem
Existing semiconductor materials like amorphous and polycrystalline silicon for electronic devices have limitations in charge mobility and stability, and oxide semiconductors face challenges in controlling electric characteristics, which affect the performance of devices such as thin film transistors.
Innovation Solution
A solution composition for forming an oxide thin film using a combination of zinc, indium, and magnesium compounds, with specific atomic ratios, which are used to create a magnesium indium zinc oxide (MgIZO) or hafnium indium zinc oxide (HfIZO) semiconductor, improving solubility and uniformity, and applied in electronic devices like thin film transistors without complex high-cost manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amorphous silicon is used as semiconductor material, then manufacturing process is simple, but charge mobility is insufficient
Solution Approach 1:
The patent uses composite oxide semiconductor materials (In-Ga-Zn-O and In-Al-Zn-O systems) that combine multiple metal elements to achieve both high charge mobility and manufacturing simplicity. The composite nature of these materials allows optimization of electrical properties while maintaining solution-based fabrication processes.
Solution Approach 2:
The patent systematically varies compositional parameters (atomic ratios of In, Ga, Zn, Al, and O) to optimize charge mobility. By changing the concentration of specific metal elements and their ratios, the material achieves superior electrical characteristics while retaining simple solution processing methods.
2Reliability
If polycrystalline silicon is used as semiconductor material, then charge mobility is increased, but manufacturing process becomes complex and costly
Solution Approach 1:
The patent replaces complex mechanical/thermal crystallization processes with solution-based chemical deposition methods. By using metal organic compounds in solution that can be deposited and then converted to functional oxide semiconductors, the patent achieves high charge mobility without requiring sophisticated crystallization equipment or multi-step processing.
Solution Approach 2:
The patent introduces metal organic compounds as intermediary materials that facilitate the formation of high-performance oxide semiconductors. These organic precursors enable controlled deposition of metal elements that subsequently form the desired oxide structure with high charge mobility, bypassing the need for direct crystallization of silicon.
3Reliability
If oxide semiconductors are used to compensate for silicon limitations, then charge mobility can be improved, but electrical characteristic control becomes difficult
Solution Approach 1:
The patent applies local quality control by optimizing specific regions of the oxide semiconductor material. By controlling the composition gradients, interface structures, and local stoichiometry in different layers and regions, the patent achieves precise control over electrical characteristics while maintaining high overall charge mobility.
Solution Approach 2:
The patent implements feedback control through systematic characterization of electrical properties and iterative optimization of composition parameters. By measuring charge mobility, threshold voltage, and other electrical characteristics, and adjusting the metal organic compound formulations accordingly, the patent achieves reliable control over device performance.
Data Source
AI summary
A solution composition for forming an oxide thin film may include a first compound including zinc, a second compound including indium, and a third compound including magnesium or hafnium, and an electronic device may include an oxide semiconductor including zinc, indium, and magnesium. The zinc and hafnium may be included at an atomic ratio of about 1:0.01 to about 1:1.