Solution-Processable Amorphous Superatomic Thin Films
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Solution Overview
Problem
Existing superatomic ionic crystals formed by electrostatic interactions are unsuitable for use in devices due to crystallization, necessitating improved techniques for solution-processable amorphous superatomic thin films with tunable properties.
Innovation Solution
The development of solution-processable superatomic thin films comprising metal-containing superatoms and fullerene derivatives, such as Co6Te8(PPr3)6 and [6,6]-phenyl-C61-butyric acid methyl ester, which are mixed in specific ratios to control electrical and thermal conductivity, and are characterized by their amorphous and homogeneous nature, achieved through the frustration of electrostatic interactions using flexible side-chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostatic interactions are used to form superatomic ionic crystals, then electrical transport and magnetic properties are achieved, but crystallization occurs making them unsuitable for device application
Solution Approach 1:
The patent changes the physical state parameter from crystalline to amorphous by controlling the cooling rate and processing conditions. This prevents the formation of ordered ionic pairs while maintaining the electrostatic interactions needed for electrical transport, making the material suitable for device application.
Solution Approach 2:
The patent creates a composite system combining metal-containing superatoms with organic ligands in an amorphous matrix. This composite structure maintains the beneficial electrostatic interactions for electrical transport while the amorphous organic matrix prevents crystallization and ionic pair formation.
2Ease of manufacture
If amorphous structure is achieved to prevent crystallization, then solution-processability is improved, but manufacturing precision and film quality may be compromised
Solution Approach 1:
The patent optimizes processing parameters including solvent selection, concentration, drying rate, and annealing temperature to achieve high-quality amorphous films through solution processing. By carefully controlling these parameters, film quality comparable to or exceeding crystalline materials is achieved while maintaining solution-processability.
Solution Approach 2:
The patent uses organic ligands and solvents as intermediaries to facilitate solution processing. These intermediaries enable the metal-containing superatoms to be dissolved and processed in solution, then removed or transformed during film formation, achieving both solution-processability and high film quality.
3Reliability
If electrostatic interactions are dominated in superatomic ionic crystals, then electrical transport properties are achieved, but ionic pairs crystallize reducing functionality
Solution Approach 1:
The patent creates a composite where metal-containing superatoms provide electrical transport through electrostatic interactions while organic ligands and matrix materials stabilize the amorphous structure. The organic components act as spacers and stabilizers that prevent ionic pair crystallization while allowing beneficial electrostatic interactions to persist.
Solution Approach 2:
The patent introduces organic ligands as intermediaries between metal-containing superatoms. These ligands mediate the interactions by maintaining appropriate spacing and preventing direct ionic pairing that would lead to crystallization, while still allowing electrostatic interactions necessary for electrical transport to occur.
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 resulting thin films exhibit high optical transparency, adjustable electrical conductivity, and improved thermal transport properties, making them suitable for applications in wearable electronics, thermoelectric devices, and other flexible electronics, while maintaining solution-processability and integratability.
Implementation Method 1
Formation of superatomic ionic crystals can be dominated by the electrostatic interactions between the constituent clusters
Implementation Method 2
certain nanoscale clusters can be used to assemble functional materials with various properties. Some nanoscale clusters can assemble into ionic crystals with collective electrical transport and magnetic properties through electron transfer between the constituent clusters
Implementation Method 3
The thin film can have a thermal conductivity of about 0.05 W m-1K-1
Data Source
AI summary
Ionic superatomic materials that can be solution-processed into completely amorphous and homogeneous thin films are disclosed herein. The amorphous materials disclosed herein have tunable compositions and have electrical conductivities of up to 300 siemens per meter, thermal conductivities of 0.05 watt per meter per degree Kelvin, and optical transparencies of up to 92%. Application of these thin-films are also provided herein.