ALD Precursor Design for Low-Carbon Indium Oxide Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The atomic layer deposition (ALD) method faces challenges in forming high-quality thin-films with low residual carbon content, particularly when using indium and zinc compounds, as existing materials like [(3-dimethylamino)propyl]dimethylindium and trimethylindium tend to result in film shrinkage or carbon contamination.
Innovation Solution
A thin-film forming raw material with specific indium or zinc compounds, represented by general formulas M(R1)x1[A1-N(R2)(R3)]y1 and Zn(R4)[A2-N(R5)(R6)], is used, allowing for the production of indium or zinc-containing thin-films with reduced carbon residue through controlled ALD processes, utilizing vaporized precursors and reactive gases like oxygen or ozone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional thin-film forming raw materials like trimethylindium or diethylzinc are used in ALD method, then film formation can be achieved, but residual carbon remains in the film and film quality deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the raw material by developing new compounds with specific molecular structures (formulas (1) and (2)) that have lower carbon content and different decomposition characteristics. This structural parameter change enables reduced residual carbon in the film while maintaining film formation capability through ALD process
Solution Approach 2:
The invention creates composite chemical structures combining metal centers (indium or zinc) with specific organic ligands (amino alcohol or amino ether groups) that provide both reactivity for ALD and reduced carbon residue. The composite molecular design allows simultaneous achievement of film formation and carbon reduction
2Reliability
If [(3-dimethylamino)propyl]dimethylindium is used for ALD method, then film formation is possible, but film shrinks and breaks during cooling
Solution Approach 1:
The invention changes the thermal and chemical parameters of the raw material by designing compounds with specific ligand structures (amino alcohol or amino ether groups) that modify the film's thermal expansion characteristics and bonding strength. This enables the film to maintain integrity during temperature cycling from deposition to cooling
3Manufacturing precision
If existing indium compounds are used in ALD method, then film formation can proceed, but carbon contamination occurs and film homogeneity deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the raw material by using compounds with amino alcohol or amino ether ligands that decompose more completely or leave minimal carbon residue. This chemical parameter change results in reduced carbon contamination and improved film homogeneity
Solution Approach 2:
The invention utilizes the oxidizing capability of the amino alcohol or amino ether groups during the ALD process to promote complete oxidation and removal of carbon-containing byproducts. This accelerated oxidation reduces carbon contamination in the final film
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 high-quality thin-films with minimal residual carbon, achieving uniformity and stability in film formation across a wide temperature range, improving the ALD method's efficiency and film quality.
Implementation Method 1
a step of causing a molecule of a raw material compound to adsorb to the surface of the substrate or the surface of a film
Implementation Method 2
a step of causing a molecule of a raw material compound to adsorb to the surface of the substrate or the surface of a film
Implementation Method 3
a film formation step based on a reaction between the molecule having adsorbed to the surface of the substrate or the surface of the film and a reactive gas
Implementation Method 4
various compounds have been reported... trimethylindium is given as an example of a precursor containing indium for forming a layer of indium oxide
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 general formula (1):M(R1)x1[A1-N(R2)(R3)]y1 (1)in the formula (1), R1, R2, and R3 each independently represent a linear or branched alkyl group having 1 to 4 carbon atoms, A1 represents a linear or branched alkylene group having 1 to 5 carbon atoms, x1 represents an integer of from 0 to 2, y1 represents an integer of from 1 to 3, and M represents an indium atom or a zinc atom, provided that when M represents an indium atom, a compound in which x1 represents 2, y1 represents 1, and R1, R2, and R3 each represent a methyl group is excluded.