Semiconductor Memory Cell With Oxidation-Reduction Interface
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Solution Overview
Problem
Current semiconductor devices face challenges in improving operation characteristics and reliability, particularly in miniaturization, low power consumption, and high performance, due to limitations in switching characteristics and threshold voltage management.
Innovation Solution
A semiconductor device incorporating a memory cell with a switching material layer and an oxidation-reduction reversible material layer, where an oxidation interface is generated or dissipated in response to different electrical signal polarities and amplitudes, allowing for threshold voltage changes to store logic states without the need for separate select and memory elements, simplifying manufacturing and enhancing operation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a memory cell uses traditional separate select and memory elements, then select control and memory storage functions are achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the select element and memory element into a single integrated memory cell structure. The memory cell includes a first electrode, a second electrode, a switching material layer, and an oxidation-reduction reversible material layer, where the switching material layer serves both as the select element (providing threshold voltage switching) and the memory element (storing data through resistance changes). This merging eliminates the need for separate select and memory elements, reducing device complexity and simplifying the manufacturing process.
2Reliability
If threshold voltage is changed through oxidation interface generation, then data storage capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes parameter changes in the oxidation-reduction reversible material layer to achieve reliable data storage. By applying specific voltages with different polarities, the material layer undergoes oxidation reactions to generate an oxidation interface (increasing threshold voltage for data '0') or reduction reactions to dissipate the oxidation interface (decreasing threshold voltage for data '1'). This parameter-based approach allows for reliable data storage through controllable chemical state changes, while the inherent stability of oxidation-reduction reactions provides robustness against manufacturing variations.
3Use of energy by moving object
If miniaturization is pursued for low power consumption, then device size is reduced, but operation characteristic control becomes more difficult
Solution Approach 1:
The patent employs phase transitions in the oxidation-reduction reversible material layer to achieve miniaturization with maintained operation control. The material layer transitions between oxidized and reduced states, which correspond to different resistance states and threshold voltage levels. These phase transitions are triggered by applied voltages and provide distinct, stable states that are easily distinguishable even in miniaturized devices. The clear separation between states during phase transitions ensures reliable operation characteristics despite reduced device dimensions and lower power consumption.
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 improves integration, operation characteristics, and reliability of semiconductor devices by enabling efficient threshold voltage management and data storage through reversible oxidation-reduction reactions, reducing manufacturing complexity and enhancing performance.
Implementation Method 1
performing a reset operation of changing a threshold voltage of a memory cell from a second threshold voltage to a first threshold voltage higher than the second threshold voltage, by applying a reset voltage of a first polarity to the memory cell, wherein the memory cell is coupled to a word line and a bit line and including a switching material layer and an oxidation-reduction reversible material layer and an oxidation interface is generated between the switching material layer and the oxidation-reduction reversible material layer in response to the reset voltage
Implementation Method 2
performing a set operation of changing the threshold voltage of the memory cell from the first threshold voltage to the second threshold voltage by applying a set voltage of a second polarity different from the first polarity to the memory cell, wherein the oxidation interface is dissipated in response to the set voltage
Data Source
AI summary
A semiconductor device may include a word line, a bit line crossing the word line, and a memory cell coupled to the word line and the bit line to receive an electrical signal to control the memory cell and including a switching material layer and an oxidation-reduction reversible material layer that is in contact with the switching material layer to allow for either oxidation reaction or reduction reaction to occur in response to different amplitudes and different polarities of the electrical signal, wherein the oxidation-reduction reversible material layer and the switching material layer responds to a first threshold voltage and a first polarity of the electrical signal to generate an oxidation interface between the switching material layer and the oxidation-reduction reversible material layer, and responds to a second threshold voltage and a second polarity of the electrical signal to reduce the generation of the oxidation interface.