Oxide Gate Insulator Coating for Low-Temperature High-k TFTs
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Solution Overview
Problem
Current methods for producing field-effect transistors with oxide insulator films having high dielectric constants are costly and complex, requiring vacuum processes and limiting the control over film formulation and characteristics.
Innovation Solution
A field-effect transistor with a gate insulating layer composed of an oxide insulator film containing Zr, Hf, Be, Mg, Sc, Y, or lanthanoid elements, formed using a coating liquid that includes these elements and a solvent, allowing for low-temperature processing and high dielectric constant films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum processes (sputtering, CVD, ALD) are used to form oxide insulator films, then film quality and dielectric constant are improved, but apparatus complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces vacuum-based physical vapor deposition (sputtering) and chemical vapor deposition (CVD) processes with a liquid-phase coating method. Instead of using complex vacuum chambers and source gases, the invention uses liquid precursors that are coated onto substrates and then thermally processed to form high-quality oxide insulator films with high dielectric constants, thereby eliminating the need for expensive vacuum apparatus while maintaining film quality
Solution Approach 2:
The invention changes the physical state of the precursor material from gaseous (in CVD/sputtering) to liquid form. This parameter change enables the use of simple coating techniques such as spin coating, dip coating, or spray coating instead of complex vacuum deposition processes, while still achieving high-quality oxide films through subsequent thermal treatment
2Manufacturing precision
If vacuum processes are used to form oxide insulator films, then film characteristics are controlled, but source gas limitations restrict formulation flexibility
Solution Approach 1:
The patent changes the precursor delivery system from gaseous to liquid state, which fundamentally expands formulation flexibility. Liquid precursors can incorporate a wide variety of metal salts, organic ligands, and additives that are not feasible in gas-phase processes, enabling precise control over film composition, stoichiometry, and properties while maintaining manufacturing precision through controlled thermal processing
3Temperature
If conventional methods are used to produce high dielectric constant oxide films, then process temperature is reduced, but film uniformity and quality deteriorate
Solution Approach 1:
The invention changes the chemical composition and reactivity of the precursor materials to enable low-temperature film formation. By using specially designed liquid precursors with appropriate decomposition temperatures and reaction kinetics, high-quality uniform oxide films with high dielectric constants can be formed at lower processing temperatures than conventional methods, improving both energy efficiency and film quality
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 solution enables the production of field-effect transistors with high dielectric constant oxide insulator films at low process temperatures, reducing costs and improving film uniformity and characteristics.
Implementation Method 1
A field-effect transistor with a gate insulating layer composed of an oxide insulator film containing Zr, Hf, Be, Mg, Sc, Y, or lanthanoid elements, formed using a coating liquid that includes these elements and a solvent
Data Source
AI summary
A field-effect transistor including: a source electrode and a drain electrode; a gate electrode; a semiconductor layer; and a gate insulating layer, wherein the gate insulating layer is an oxide insulator film including A element and B element, the A element being one or more selected from the group consisting of Zr and Hf and the B element being one or more selected from the group consisting of Be and Mg.