Acid-Stabilized Precursor Solutions for Crack-Free Titanium Oxide Films
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Solution Overview
Problem
Existing liquid phase deposition methods for forming titanium-containing oxide films often result in cracking due to shrinkage during curing, which can lead to poor optical performance and device failure.
Innovation Solution
The use of acid-stabilized precursor solutions comprising titanium ions, one or more additional metal ions such as lanthanum and tellurium, a photolyzable and/or pyrolyzable ligand, and an acid, which are then exposed to heat or light to form crack-free and low-cracking titanium-containing oxide films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid phase deposition is used to form titanium-containing oxide films, then the films can be deposited with good coverage and uniformity, but cracking occurs during curing due to shrinkage
Solution Approach 1:
The patent modifies the chemical composition parameters of the precursor solution by incorporating specific metal ions (La3+, Te4+) alongside titanium ions, and adjusting acid concentration and pH levels. These parameter changes alter the film's shrinkage characteristics during curing, enabling thick film deposition without cracking while maintaining uniformity.
Solution Approach 2:
The patent creates a composite oxide film system containing multiple metal ions (Ti, La, Te) rather than using pure titanium oxide. This composite approach allows the different metal ions to work synergistically, where La3+ and Te4+ modify the structural evolution during curing to prevent crack formation in thick films.
2Quantity of substance
If thicker films are deposited to improve optical element performance, then the optical performance is enhanced, but cracking increases during curing
Solution Approach 1:
By changing the precursor solution composition parameters (adding La3+, Te4+, adjusting acid content), the patent enables the deposition of thicker films (up to 100 nm or more) that maintain structural integrity during curing. The modified chemistry reduces shrinkage stress that would otherwise cause cracking in thick films.
Solution Approach 2:
The patent achieves uniform compositional distribution throughout the thick film volume, ensuring consistent local properties that prevent localized stress concentration and crack initiation. The acid-stabilized precursor solution maintains homogeneous metal ion distribution even in thick deposits.
3Stability of the object's composition
If the precursor solution is stabilized with acid to prevent precipitation, then solution stability is improved, but the deposition process complexity increases
Solution Approach 1:
The patent uses acid stabilization (controlling pH and acid concentration) to maintain precursor solution stability, preventing metal ion precipitation before deposition. This simple parameter control (acid addition) achieves stability without requiring complex stabilization mechanisms or additional process steps.
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 formation of crack-free titanium-containing oxide films with improved optical performance, reduced crystallinity, and the ability to achieve thicker films without cracking, enhancing the reliability and efficiency of optical elements and thin-film transistors.
Implementation Method 1
a photolyzable and/or pyrolyzable ligand
Implementation Method 2
a photolyzable and/or pyrolyzable ligand
Implementation Method 3
coating a substrate with an acid-stabilized precursor solution to form a film
Data Source
AI summary
Examples are disclosed that relate to the use of acid-stabilized precursor solutions for forming low-cracking and crack-free titanium-containing oxide films by liquid phase deposition. One example provides a method for forming a titanium-containing oxide film by liquid-phase deposition. The method comprises film a substrate with an acid-stabilized aqueous precursor solution to form a film. The acid-stabilized aqueous precursor solution comprises titanium ions, one or more other metal ions, a photolyzable and/or pyrolyzable ligand, and an acid. The method further comprises exposing the film to one or more of heat or light. Examples are also disclosed that relate to forming optical devices using liquid phase deposition of metal oxide films.