Gallium Indium ALD Precursor Thermal Stability
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Solution Overview
Problem
Existing thin-film forming raw materials for atomic layer deposition (ALD) methods lack sufficient thermal stability, making it difficult to produce high-quality thin-films.
Innovation Solution
A thin-film forming raw material comprising a gallium or indium compound with a specific structure, represented by a general formula (1), which includes alkyl groups that can be partially substituted with fluorine atoms, is used to enhance thermal stability and enable high-quality thin-film production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thin-film forming raw materials (trialkylgallium, trialkylindium, indium dialkylamidinate, indium dialkylguanidinate, gallium trihalide) are used in ALD method, then the ALD process can be performed, but the thermal stability is insufficient and high-quality thin-film cannot be formed
Solution Approach 1:
The patent changes the chemical structure parameters of the raw material by introducing specific ligand combinations (β-diketonate + alkoxide or carboxylate) and controlling the R1/R2 group configurations. These structural parameter changes result in compounds with higher thermal stability that can maintain integrity during ALD processing, directly resolving the thermal stability issue while enabling high-quality thin-film formation
Solution Approach 2:
The patent creates composite molecular structures by combining multiple ligand types (β-diketonate, alkoxide, or carboxylate) around the gallium or indium center. This composite approach at the molecular level produces raw materials with enhanced thermal stability compared to simple trialkyl compounds, while maintaining the desired reactivity for ALD processes
2Ease of manufacture
If trimethylgallium is used in ALD method, then gallium nitride layer can be deposited, but the thermal stability is insufficient
Solution Approach 1:
The patent modifies the molecular parameters of trimethylgallium by replacing one or more methyl groups with specifically designed ligand systems containing β-diketonate, alkoxide, and carboxylate groups. This parameter change maintains the deposition capability while significantly improving thermal stability, allowing the compound to withstand ALD processing temperatures without decomposing
3Adaptability or versatility
If CVD method is used with various materials, then thin-film formation is possible, but the materials may not be suitable for ALD method due to insufficient ALD window
Solution Approach 1:
The patent optimizes the thermal and chemical parameters of the raw material through careful selection of ligand types and R1/R2 group configurations. This parameter optimization creates a wide ALD window by ensuring the compound remains stable at lower temperatures (preventing premature decomposition) while maintaining sufficient reactivity at higher temperatures (enabling complete reaction during ALD cycles), making it suitable for ALD methodology
Solution Approach 2:
Instead of adapting ALD conditions to match conventional CVD materials, the patent inverts the approach by designing materials specifically optimized for ALD conditions. The molecular structure is configured to thrive in ALD's controlled, lower-temperature environment rather than requiring CVD's high-temperature conditions, thereby expanding the ALD window
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 new raw material achieves high-quality thin-film formation with improved thermal stability, allowing for efficient production of gallium or indium-containing thin-films using the ALD method.
Implementation Method 1
adsorbing the compound in a raw material gas, which is obtained by vaporizing the thin-film forming raw material, onto the surface of the substrate, to form a precursor thin-film
Implementation Method 2
subjecting the precursor thin-film to a reaction with a reactive gas, to form the thin-film containing an indium atom or a gallium atom
Implementation Method 3
a raw material gas, which is obtained by vaporizing the thin-film forming raw material
Data Source
AI summary
Provided is a thin-film forming raw material, which is used in an atomic layer deposition method, including a compound represented by the following formula (1):where R1 and R2 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, L represents a group represented by the following formula (L-1) or (L-2), and M represents an indium atom or a gallium atom;where R11 and R12 each independently represent a hydrogen atom, a fluorine atom, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 5 carbon atoms, and * represents a bonding position with M in the formula (1);where R21 to R23 each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 5 carbon atoms, and * represents a bonding position with M in the formula (1), provided that R21 and R22 represent different groups.