Aluminum Precursor Powder for Low-Temperature Conductive Layers
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Solution Overview
Problem
The challenge lies in developing a method for manufacturing a high-conductivity aluminum layer at low temperatures using aluminum precursor powders, as existing methods face issues with physical instability, high reactivity, and the need for high-temperature heat treatment, which limits their application in flexible and organic electronic devices.
Innovation Solution
A metal precursor powder with controlled Gibbs free energy change is prepared and stored to prevent decomposition, then dissolved in a solvent to form a stable ink, which is used for wet printing or coating processes, allowing for the formation of conductive metal layers or patterns with uniform thickness and electrical characteristics through decomposition at moderate temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If aluminum powder paste is used for wet coating process, then coating time is reduced and normal pressure atmosphere is used, but high-temperature heat treatment (800°C or higher) is required to break oxidized film and achieve conductivity
Solution Approach 1:
The invention changes the chemical composition parameters of the aluminum powder by adding specific elements (Li, Na, K, Ca, Sr, Ba, Mg, Al, Si, B, P, C, N, O, F, Cl, Br, I, or their combinations) in controlled amounts (0.1-10 wt% each) to modify the oxide layer properties, enabling low-temperature sintering while maintaining conductivity
Solution Approach 2:
The invention creates a composite aluminum powder material by combining aluminum with other metallic elements, forming a multi-element composite that exhibits improved sintering behavior and conductivity at lower temperatures compared to pure aluminum powder
2Manufacturing precision
If vacuum deposition process is used to form aluminum layer, then pure aluminum layer with desired thickness is achieved, but apparatus cost is high, time and energy for vacuum maintenance are long and high, and 70% or more of raw materials are lost
Solution Approach 1:
The invention replaces the mechanical vacuum deposition system with a chemical wet coating process followed by low-temperature sintering, substituting a complex mechanical-vacuum system with simpler chemical and thermal processes that achieve comparable or superior results
3Ease of operation
If aluminum powder is used in wet printing process, then coating can be performed at normal pressure, but oxidized film forms on aluminum powder surface requiring high-temperature treatment
Solution Approach 1:
The invention converts the harmful oxidized film into a beneficial component by incorporating oxygen and other elements into the powder composition, creating a controlled oxide layer that facilitates low-temperature sintering and conductivity development rather than requiring complete oxide removal
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 conductive metal layers with specific resistivity of 1.5 to 500 μΩ·cm, suitable for various electronic devices, including OLEDs, solar cells, and flexible electronics, while maintaining chemical stability and uniformity.
Implementation Method 1
decomposing a metal precursor in the formed layer or pattern to form a conductive metal layer or pattern
Data Source
AI summary
A metal precursor powder, a method of manufacturing a conductive metal layer or pattern, and an electronic device including the same, are provided, and in the metal precursor powder, the Gibbs free energy change of hydrogen removal at a temperature range of −25° C. to 25° C. is −100 kJ/mol to 300 kJ/mol.