Amorphous Metal Oxide Semiconductor Layer for Low-Temperature Firing
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Solution Overview
Problem
Conventional methods for forming amorphous metal oxide semiconductor layers through coating techniques face challenges such as high temperature requirements, substrate degradation, and impurities affecting device performance, leading to inconsistent quality and density issues.
Innovation Solution
A precursor composition comprising a metal salt, a primary amide, and a water-based solution is used, which is applied and fired at a temperature between 150°C and 300°C to form a dense amorphous metal oxide semiconductor layer, allowing for low-temperature processing and reducing substrate degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a coating technique is used to form a metal oxide semiconductor layer, then the manufacturing process becomes simpler and cost-effective, but the formed layer lacks density and has poor quality
Solution Approach 1:
The invention changes the chemical composition parameters of the precursor solution by incorporating specific metal organic compounds and controlling the ratio of metal elements (In:Ga:Zn = 1:(0.05-1):(0.05-1)). This compositional parameter change enables the coating-formed layer to achieve high density and crystallinity, resolving the quality issue while maintaining the simplicity of the coating manufacturing method
Solution Approach 2:
The invention uses a composite precursor solution containing multiple metal organic compounds (indium, gallium, and zinc-based compounds) combined with specific solvents and additives. This composite material approach allows the coating process to produce a dense, high-quality metal oxide semiconductor layer with controlled crystallinity, overcoming the limitation of simple coating methods
2Manufacturing precision
If high temperature firing is used to improve layer quality and reduce variations, then the semiconductor layer quality improves, but substrates with low heat resistance deteriorate or decompose
Solution Approach 1:
The invention changes the firing temperature parameter from conventional high temperatures to a lower range (150-300°C). This temperature parameter change, combined with the optimized precursor composition, enables high-quality layer formation without substrate degradation, making the process compatible with plastic and other low heat-resistant substrates
Solution Approach 2:
The invention achieves local quality control by optimizing the precursor solution composition to ensure uniform decomposition and reaction at low temperatures. The controlled metal element ratios and solvent selection create localized chemical environments that promote dense layer formation even at reduced firing temperatures, preventing both quality variations and substrate damage
3Object-affected harmful factors
If the firing temperature is kept low to protect the substrate, then substrate degradation is prevented, but impurities remain in the formed layer affecting device performance
Solution Approach 1:
The invention changes the chemical parameters of the precursor solution by selecting specific metal organic compounds and solvents that decompose completely at low temperatures (150-300°C). This parameter change ensures that no residual impurities remain in the formed layer, achieving high device performance while maintaining substrate protection through low-temperature processing
Solution Approach 2:
The invention uses specific solvents and organic ligands as intermediaries that facilitate complete decomposition and conversion of metal precursors at low temperatures. These intermediary substances ensure thorough reaction and purification during the low-temperature firing process, eliminating impurities without requiring high temperatures that would damage the substrate
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 enables the formation of a high-density amorphous metal oxide semiconductor layer at lower temperatures, improving device performance and consistency while being compatible with a wide range of substrates, including those with low heat resistance.
Implementation Method 1
the pyrolysis behavior of a precursor composition is analyzed in advance through thermal analysis of the composition
Implementation Method 2
a metal complex is dissolved in a solvent to thereby form a precursor composition; the precursor composition is applied onto a substrate through a coating technique such as spin coating or ink-jet coating; and the coating is fired, whereby a metal oxide semiconductor layer is formed
Data Source
AI summary
Methods for producing the amorphous metal oxide semiconductor layer where amorphous metal oxide semiconductor layer is formed by use of a precursor composition containing a metal salt, a primary amide, and a water-based solution. The methodology for producing the amorphous metal oxide semiconductor layer includes applying the precursor composition onto a substrate to form a precursor film, and firing the film at a temperature of 150° C. or higher and lower than 300° C.