Chalcogenide Selector Device Ion Supply Layer Leakage
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Solution Overview
Problem
Conventional selector devices have limitations such as small on-off current ratio, high leakage current, and complex material requirements, which hinder their efficiency and integration in storage devices.
Innovation Solution
A selector device with a switching layer comprising a chalcogenide metal ion supply layer and a conversion layer, stacked in symmetric or asymmetric structures, using materials like AgSx, CuSx, and GeTex, with specific atomic percentages and doping, between metal electrode layers, allowing for high on-state current and low subthreshold swing, reducing leakage and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional selector devices (OTS, MIT, MIEC, wire-based threshold switching devices) are used, then the device structure is relatively simple or materials are available, but the on-off current ratio is small and leakage current is high
Solution Approach 1:
The patent employs composite material structures including metal-chalcogenide combinations (Ag-S, Cu-S, Ge-Te), doped chalcogenide materials (AgInSbTe, AgSbTe), and multi-layer stacked assemblies (ABA or BAB structures). These composite materials enable high on-state current (>100 μA) while maintaining low off-state leakage current through the synergistic properties of different material components.
Solution Approach 2:
The invention introduces localized functional regions within the switching layer, including ion supply layers with specific metal atomic percentages (0-50%), conversion layers with tailored compositions, and doped regions. Each layer is optimized locally to provide specific functions: ion supply for conductive filament formation, conversion for resistance switching, and doping for enhanced electrical properties.
2Reliability
If MIEC materials are used in selector devices, then the device can achieve switching functionality, but the material composition becomes complex
Solution Approach 1:
The switching layer is segmented into distinct functional sub-layers: ion supply layers (providing metal ions), conversion layers (exhibiting resistance switching), and doped regions (enhancing electrical properties). This segmentation allows each layer to be optimized independently for its specific function while maintaining overall device simplicity through clear functional separation.
3Device complexity
If wire-based threshold switching devices are used, then the device structure is simple, but the on-state current is below 100 μA
Solution Approach 1:
The patent systematically varies material composition parameters including metal atomic percentages (0-50% in ion supply layers), chalcogenide ratios (Sx, Sex, Tex where x varies), and doping concentrations (S, N, O, Si dopants). These parameter changes enable precise control of electrical properties to achieve on-state current >100 μA while maintaining device structural simplicity.
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 device achieves higher on-state current, suppressed leakage current, and rapid switching capabilities, enabling its use in various storage devices with increased memory density and reduced operational power consumption.
Implementation Method 1
the ion supply layer comprises a chalcogenide metal material having a metal atomic content of more than 0% and not more than 50% with respect to the chalcogenide metal material
Implementation Method 2
a conversion layer, wherein the conversion layer comprises a chalcogenide material
Data Source
AI summary
A selector device including a first metal electrode layer, a second metal electrode layer and a switching layer disposed between the first metal electrode layer and the second metal electrode layer. The switching layer is a stacked assembly of ABA, BAB, AB or BA, where A is an ion supply layer, and B is a conversion layer. The ion supply layer includes a chalcogenide metal material having a metal atomic content of more than 0% and not more than 50% with respect to the chalcogenide metal material. The conversion layer includes a chalcogenide material.