Switching Device Ion Conducting Layer Metal Ion Diffusion
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Solution Overview
Problem
Switching devices using oxide ion conductors in CMOS manufacturing processes face issues with increased leakage current and failure to maintain the OFF state due to metal ion diffusion, leading to reliability concerns in programmable logic devices.
Innovation Solution
A switching device with an ion conducting layer containing a complex oxide, such as tantalum oxide and silicon oxide, where the first electrode supplies electrons and the second electrode supplies metal ions, preventing metal ion diffusion during the manufacturing process, thereby maintaining low leakage current and high reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oxide ion conducting layer is used in a switching device, then the switching voltage can be raised and affinity for CMOS manufacturing process is improved, but metal ions diffuse in the ion conducting layer during heat treatment, causing increased leakage current and reliability degradation
Solution Approach 1:
A barrier layer is introduced as an intermediary between the metal electrode and the oxide ion conducting layer. This barrier layer prevents metal ions from diffusing into the ion conducting layer during heat treatment, thereby eliminating the harmful effect of metal ion diffusion while maintaining the benefits of using oxide ion conductors in CMOS manufacturing processes.
Solution Approach 2:
The switching device employs a composite structure consisting of multiple layers including the oxide ion conducting layer and the barrier layer. This composite material approach allows the device to combine the advantageous properties of oxide ion conductors (high switching voltage, CMOS compatibility) with the protective function of the barrier layer (ion diffusion prevention), achieving both performance and reliability.
2Volume of moving object
If a two-terminal switch structure is used, then the device dimensions can be decreased to the nm order, but a large current flows through the switch upon connection and disconnection, damaging the logic device
Solution Approach 1:
The barrier layer serves as a mediator that not only prevents ion diffusion but also helps control the formation and dissolution of metal bridges. This allows the compact two-terminal structure to maintain its small dimensions while reducing harmful current spikes during switching operations.
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 effectively suppresses metal ion diffusion, maintaining low leakage current and high reliability of the switching device without degrading switching performance, even after heat treatment, and allows for reliable operation in programmable logic devices.
Implementation Method 1
a switching device which is used in an electronic device such as a programmable logic or memory device and utilizes an electrochemical reaction
Implementation Method 2
the metal ions of the electrode which supplies them diffuse in the ion conducting layer during a heat treatment in the CMOS manufacturing process
Data Source
AI summary
A switching device includes a first electrode (101), a second electrode (102), and a complex oxide ion conducting layer (103) interposed between the first electrode (101) and the second electrode (102). The complex oxide ion conducting layer (103) contains at least two oxides including a metal oxide. The first electrode (101) can supply electrons to the complex oxide ion conducting layer (103). The second electrode (102) contains a metal and can supply ions of the metal to the complex oxide ion conducting layer (103).