Indium Compound Precursors for Uniform High-Temperature Thin Films
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Solution Overview
Problem
Existing indium precursors face challenges in achieving uniform composition and thickness during large-area deposition, particularly due to thermal decomposition at high temperatures and vapor pressure issues, limiting the production of high-quality thin films.
Innovation Solution
A novel indium compound with improved thermal stability and volatility, formulated as a composition for thin film deposition, is used in conjunction with gallium and zinc precursors to produce a uniform indium-containing thin film through methods like ALD and CVD, ensuring consistent vapor pressure and film quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional indium precursors are used for thin film deposition, then deposition can be performed, but thermal decomposition occurs at high temperatures (250°C or more) causing poor film quality and non-uniform composition
Solution Approach 1:
The patent modifies the molecular structure of indium precursors by changing ligand types and stoichiometry ratios. Specifically, it uses indium compounds with organic ligands (such as β-diketonates, carboxylates, alkoxides) where the ligand-to-indium ratio is controlled between 2:1 and 4:1. This structural parameter change raises the thermal decomposition temperature above 250°C, enabling stable deposition without premature decomposition and achieving uniform film composition.
2Ease of operation
If solid indium precursors are used for CVD, then deposition is possible, but vapor pressure control becomes difficult resulting in poor reproducibility
Solution Approach 1:
The patent employs indium precursors that undergo controlled phase transitions from solid to vapor phase at specific temperatures. By selecting precursors with appropriate vapor pressure characteristics (decomposition temperature >250°C), the material transitions smoothly to vapor phase for deposition. This controlled phase transition enables precise vapor pressure control and reproducible deposition rates, eliminating the variability associated with solid precursor handling.
3Productivity
If sputtering is used to form indium thin films, then films can be deposited, but composition uniformity cannot be maintained during large-area deposition
Solution Approach 1:
The patent replaces the mechanical sputtering process with a chemical vapor deposition approach using volatile indium precursors. Instead of using a sputter target where composition is fixed by target material, the invention uses vapor-phase precursors that can be uniformly distributed across large substrate areas. The precursors decompose thermally to form uniform indium films, eliminating the composition non-uniformity problem inherent in large-area sputtering while maintaining high productivity.
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 novel indium compound enables high-quality, uniform thin films with stable deposition rates and improved electrical properties, suitable for three-dimensional devices, by maintaining consistent composition and thickness even at high temperatures.
Implementation Method 1
the indium compound may have a thermal decomposition temperature of 250 to 500° C.
Implementation Method 2
a method for manufacturing an indium-containing thin film, the method including: a) raising a temperature of a substrate mounted in a chamber; b) injecting and adsorbing a composition for thin film deposition containing indium
Implementation Method 3
there is a need to develop a high-quality indium precursor that has excellent thermal stability at high temperatures and is uniformly deposited
Data Source
AI summary
The present invention provides a novel indium compound, a preparation method therefor, an indium-containing thin film deposition composition comprising same, and an indium-containing thin film manufacturing method employing same. A high quality indium-containing thin film, which contains uniform components, can be manufactured to have a stable deposition rate.