Conductive Layers Using Low-Temperature Exothermic Precursors
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Solution Overview
Problem
Conventional conductive layers on plastic substrates require high curing temperatures, leading to increased resistivity and power consumption due to the high decomposition temperature of organic acidic salts, which exceeds the thermal limits of these substrates.
Innovation Solution
A conductive layer comprising metal flakes, nanometric metal spheres, and a mixture of inorganic and organic metal precursors, where the inorganic salt decomposes exothermically at low temperatures to induce a secondary reaction in the organic acidic salts, forming a continuous conductive network at temperatures below 200°C, reducing the resistivity of the layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional organic acidic salts are used for fabricating conductive layers, then the conductive layer can be formed, but the decomposition temperature exceeds 200°C which damages plastic substrates
Solution Approach 1:
The patent changes the chemical composition parameters of the metal precursor from conventional organic acidic salts to a specific organic carboxylate compound with controlled decomposition characteristics, enabling decomposition at temperatures below 200°C that are suitable for plastic substrates
Solution Approach 2:
The patent uses a composite metal precursor system combining organic carboxylate compounds with metal flakes, where the organic component decomposes at low temperature to form conductive metal networks without damaging the plastic substrate
2Reliability
If high curing temperature is used to decompose organic acidic salts, then the conductive layer forms, but the resistivity increases to 10-50 times that of pure silver
Solution Approach 1:
The patent optimizes the decomposition temperature parameter to below 200°C, which prevents excessive grain growth and oxidation of metal flakes, thereby maintaining resistivity close to that of pure silver rather than the 10-50 times increase seen in conventional high-temperature processes
Solution Approach 2:
The patent replaces the high-temperature thermal sintering mechanism with a low-temperature chemical decomposition mechanism of organic carboxylates, which forms conductive networks through controlled chemical reactions rather than mechanical sintering, achieving lower resistivity
3Adaptability or versatility
If decomposition temperature is reduced below 200°C for plastic substrates, then substrate compatibility is achieved, but conventional organic acidic salts cannot decompose sufficiently to form continuous conductive networks
Solution Approach 1:
The patent selects organic carboxylate compounds with specific molecular structures that have decomposition temperatures below 200°C, enabling the metal precursor to decompose and form conductive networks at temperatures compatible with plastic substrates
Solution Approach 2:
The organic carboxylate compound acts as an intermediary that bridges the gap between low temperature requirements and conductive network formation, decomposing at low temperatures to release metal atoms that form continuous conductive pathways without requiring high-temperature sintering
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 solution achieves a resistivity of less than 7 μΩcm, enhancing conductivity and enabling high-density, low-temperature sintering of metal layers on plastic substrates, thereby reducing power consumption and signal loss.
Implementation Method 1
Decomposition of the inorganic salts can be exothermic at low temperature to induce another high exothermic reaction of the organic acidic salts
Data Source
AI summary
Methods for forming conductive layers. A layer of metal composite is applied on a substrate, comprising a plurality of metal flakes, a plurality of nanometer metal spheres, and a plurality of mixed metal precursors. The plurality of mixed metal precursors comprises a mixture of inorganic salts and organic acidic salts. The layer of metal composite is cured to induce an exothermic reaction, thereby forming a conductive layer on the substrate at a relatively low temperature (<200° C.).