Semiconductor Device Ion Conductor Electrode Configuration
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Solution Overview
Problem
Variable resistance elements used in crossbar switches for ULSI suffer from erroneous writing due to signal amplitude from adjacent switches, leading to off disturbing issues, which are exacerbated when programming voltage is lowered to approach operating voltage, compromising reliability and voltage reduction.
Innovation Solution
A semiconductor device and operation method incorporating a cell with a first and second switching element, each with an ion conductor and electrodes, where the electrodes are connected in specific configurations to allow for controlled voltage application through a third switching element, ensuring reliable operation at lower voltages by preventing erroneous transitions between ON and OFF states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If programming voltage is lowered to approach operating voltage, then power consumption is reduced, but erroneous writing occurs due to signal amplitude from adjacent switches
Solution Approach 1:
The patent divides the switching element into multiple segments: a first switching element with first and second electrodes, a second switching element with third and fourth electrodes, and a variable resistance element. This segmentation allows independent control of programming and operating voltages, enabling low-power operation while maintaining reliability by isolating the variable resistance element from direct exposure to full programming voltage amplitudes.
Solution Approach 2:
The patent introduces a fifth electrode as an intermediary that supplies metal ions to the variable resistance element. This intermediary structure allows the variable resistance element to be programmed through controlled ion supply rather than direct voltage application, reducing susceptibility to erroneous writing from adjacent switch signals while maintaining programming effectiveness at lower voltages.
2Adaptability or versatility
If programming voltage is lowered, then voltage compatibility with operating voltage is improved, but off disturbing problem becomes more remarkable
Solution Approach 1:
The patent applies different local qualities to different electrodes: the fifth electrode is specifically designed to supply metal ions to the variable resistance element, while the first and third electrodes are configured to be less susceptible to ionization. This localized functional differentiation allows the system to operate at lower voltages compatible with operating voltage while maintaining programming capability and reducing off-disturbing effects through targeted ion supply.
Solution Approach 2:
The patent employs composite electrode structures with different materials optimized for specific functions. The fifth electrode uses materials optimized for metal ion supply, while the first and third electrodes use materials less susceptible to ionization. This composite approach enables voltage compatibility while mitigating off-disturbing problems through material-specific properties.
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 enables high reliability and low-voltage operation by maintaining the OFF state even under signal transmission, preventing disturb failures and ensuring the semiconductor device performs reliably with reduced power consumption.
Implementation Method 1
an ion conductor, a first electrode which is disposed so as to have contact with the ion conductor and supplies metal ions to the ion conductor
Implementation Method 2
a programmable logic device which is rewritable and is called FPGA has been developed as an intermediate device between the gate array and the standard cell
Implementation Method 3
the metal ion can move freely by applying an electric field or the like
Implementation Method 4
a variable resistance element using the mobility of the metal ion
Data Source
AI summary
A semiconductor device, includes first, second, and third switching elements. The third switching element comprises first and second terminals. Each of the first and second switching elements comprise a unified ion conductor, a first electrode disposed to contact the ion conductor and supply metal ions thereto, and a second electrode disposed to contact the ion conductor and is less susceptible to ionization than the first electrode. The first electrodes of the first switching element and the second switching element are electrically connected. The first terminal of the third switching element is electrically connected to only the first electrodes which are electrically connected, or the second electrode of the first switching element and the second electrode of the second switching element are electrically connected. The first terminal of the third switching element is electrically connected to only the second electrodes which are electrically connected.