Bilayer Electrolyte in Lateral PMC Cells for Faster Electrodeposition
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Solution Overview
Problem
Conventional lateral programmable metallization cell (PMC) devices suffer from slow electrodeposition reaction rates due to the low diffusivity of copper ions in oxide-based electrolytes, making them unsuitable for applications requiring rapid state changes.
Innovation Solution
The formation of a bilayer solid electrolyte (BSE) is achieved by oxidizing a thin copper film on a tungsten oxide layer and simultaneously diffusing copper into it at moderate processing temperatures, creating a semiconducting copper oxide layer that facilitates faster electrodeposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-layer oxide electrolyte is used, then the device structure is simple, but the electrodeposition rate is slow due to low copper ion diffusivity
Solution Approach 1:
The single-layer oxide electrolyte is segmented into two distinct layers: a first oxide electrolyte layer and a second oxide electrolyte layer with different materials and copper ion diffusivities. This segmentation allows each layer to perform specialized functions, with the second layer providing high diffusivity to accelerate electrodeposition while the first layer maintains structural stability.
Solution Approach 2:
The patent employs composite materials by combining two different oxide electrolyte materials in a bilayer structure. The first oxide electrolyte and second oxide electrolyte are selected from different materials with complementary properties, creating a composite electrolyte system that achieves both structural integrity and high ion transport efficiency.
2Productivity
If copper is deposited deep into the oxide electrolyte, then the electrodeposition efficiency improves, but the processing temperature must be increased which complicates manufacturing
Solution Approach 1:
The bilayer electrolyte structure implements local quality by creating regions with different copper ion diffusivities. The second oxide electrolyte layer is specifically engineered with high copper ion diffusivity to facilitate deep copper penetration and efficient electrodeposition, while the first oxide electrolyte layer provides structural support without requiring high processing temperatures.
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 enhances the electrodeposition rate, allowing for rapid switching suitable for reconfigurable electronics, MEMS, and microfluidics by ensuring electron supply proximity to metal ion abundance, thus bridging the channel efficiently.
Implementation Method 1
heating the copper and oxide electrolyte layers in an oxidizing environment to form a solid electrolyte
Implementation Method 2
heating the copper and oxide electrolyte layers in an oxidizing environment to form a solid electrolyte
Implementation Method 3
an oxidizable anode that supplies metal ions and a cathode that supplies electrons to the redox-based deposition process
Implementation Method 4
an oxidizable anode that supplies metal ions and a cathode that supplies electrons to the redox-based deposition process
Data Source
AI summary
Lateral programmable metallization cells may comprise a solid electrolyte layer, an anode coupled to the solid electrolyte layer, and a cathode coupled to the solid electrolyte layer. Exemplary solid electrolyte layers may comprise a first layer comprising an oxide electrolyte and a copper species and a second layer comprising at least one copper species, the second layer coupled to the first layer.