High-k ALD Oxide Deposition Without Interfacial Layers
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Solution Overview
Problem
Conventional semiconductor processing technologies face challenges in forming high-quality metal oxide materials without interfacial layers, especially as device sizes shrink, and struggle to achieve desirable electrical properties like dielectric constants, leakage currents, and breakdown voltages due to the formation of interfacial layers when using conventional oxygen precursors.
Innovation Solution
The use of alternative oxygen-containing precursors such as alcohols, alkoxides, hydroxides, acetylacetonates, and formates in atomic layer deposition methods to form metal oxide materials without interfacial layers, allowing for the incorporation of multiple metals and fine-tuning of material properties, and optionally switching oxygen-containing precursors during deposition to enhance electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxygen precursors are used in atomic layer deposition, then metal oxide materials can be formed, but interfacial layers are formed that degrade electrical properties
Solution Approach 1:
The patent changes the chemical parameters of the oxygen precursor from conventional options (water, ozone, oxygen plasma) to alternative compounds (alcohols, alkoxides, hydroxides, carboxylic acids). This parameter change in precursor chemistry eliminates the formation of interfacial layers while maintaining the desired metal oxide film formation, thereby improving electrical properties such as dielectric constant and breakdown voltage.
Solution Approach 2:
The patent introduces alternative oxygen-containing precursors as intermediary substances that mediate between the metal precursor and the substrate. These intermediary precursors (alcohols, alkoxides, etc.) enable oxygen transfer without causing the harmful oxidation reactions that create interfacial layers, thus protecting the metal-oxide interface quality.
2Productivity
If device sizes are reduced, then integration density increases, but maintaining material quality without interfacial layers becomes more difficult
Solution Approach 1:
By changing the precursor parameters to alternative oxygen-containing compounds, the patent achieves atomic-layer-deposited metal oxides with superior interface quality. This enables continued scaling to smaller device sizes while maintaining the necessary material quality, as the alternative precursors prevent interfacial layer formation even in ultrathin films where interface effects are most pronounced.
3Device complexity
If multiple metal layers are patterned, then device complexity increases, but removal selectivity between materials becomes harder to achieve
Solution Approach 1:
The patent creates metal oxide layers with uniform and controlled properties through the use of alternative precursors. This local quality control at the interface level ensures consistent material characteristics across multiple patterned layers, making subsequent selective removal processes more predictable and effective. The improved interface quality enables better differentiation between adjacent material layers for selective etching.
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 production of metal oxide materials with improved electrical properties, such as increased dielectric constants, reduced leakage currents, and higher breakdown voltages, while avoiding interfacial layers, thus addressing the limitations of conventional technologies.
Implementation Method 1
contacting the substrate with the first precursor. The contacting may form a layer of metal on the substrate
Implementation Method 2
contacting the layer of metal with the second precursor. The contacting may form a layer of metal oxide on the substrate
Implementation Method 3
providing a first precursor to a semiconductor processing chamber... providing a second precursor to a semiconductor processing chamber
Data Source
AI summary
Exemplary methods of semiconductor processing may include providing a first precursor to a semiconductor processing chamber. A substrate may be disposed within a processing region of the semiconductor processing chamber. The first precursor may include one or more of niobium, tantalum, or titanium. The methods may include contacting the substrate with the first precursor. The contacting may form a layer of metal on the substrate. The methods may include providing a second precursor to a semiconductor processing chamber. The second precursor comprises oxygen. The methods may include contacting the layer of metal with the second precursor. The contacting may form a layer of metal oxide on the substrate. The layer of metal oxide may be one or more of niobium oxide, tantalum oxide, or titanium oxide.