Substrate Counter-Electrode Layout for Compact Memory Cells
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Solution Overview
Problem
The complexity of producing field effect devices with counter-electrodes, particularly in achieving compactness in memory cells, is increased due to the additional electrode, making it challenging to position transistors and optimize materials and dimensions effectively.
Innovation Solution
A substrate design featuring first and second counter-electrodes in the same plane on a support substrate, separated by an electrically insulating area, with a semi-conducting area facing each counter-electrode and an additional insulating material between the semi-conducting area and the support substrate, along with a method involving etching to form these structures, allowing for easier implementation and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a counter-electrode is added to field effect devices to reduce parasite effects, then the electrostatic control on conduction channel is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The support substrate is designed to serve dual functions: as the structural foundation and as the counter-electrode. By making the support substrate conductive or sufficiently conductive, it acts as a quasi gate electrode, eliminating the need for a separate counter-electrode structure while maintaining electrostatic control over the conduction channel.
Solution Approach 2:
The counter-electrode function is extracted from being a separate component and integrated into the support substrate itself. This extraction simplifies the overall device architecture by removing the need for additional electrode structures, insulating patterns, and associated manufacturing steps.
2Ease of manufacture
If materials and dimensions are not optimized for counter-electrode architecture, then the implementation is simpler, but the counter-electrode cannot effectively modify device performances
Solution Approach 1:
The electrical conductivity parameter of the support substrate is changed or optimized to achieve sufficient conductivity for counter-electrode functionality. By adjusting material composition, doping levels, or thickness parameters, the support substrate can effectively serve as a counter-electrode without requiring complex additional structures, thus maintaining ease of manufacture while improving device performance.
3Reliability
If transistors with counter-electrodes are used in memory cells to achieve compactness, then the electrostatic control is improved, but the positioning and layout complexity increases significantly
Solution Approach 1:
The support substrate serves as both structural support and counter-electrode, eliminating the need for separate counter-electrode positioning and alignment. This multi-functionality simplifies the layout design and transistor positioning in memory cells while maintaining effective electrostatic control.
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 design enables compact integration of multiple counter-electrodes with the active area, simplifying the production process and reducing complexity, while maintaining effective electrostatic control over the conduction channels, thus enhancing the performance and compactness of field effect devices.
Implementation Method 1
an electrically insulating material separating the semi-conducting area from the support substrate
Implementation Method 2
a second electrode which presents an electrostatic effect on the conduction channel
Data Source
AI summary
A support substrate comprises first and second counter-electrodes arranged in the same plane at the level of a surface of the support substrate. An electrically insulating area separates the first and second counter-electrodes. A semi-conducting area with first and second portions is separated from the support substrate by an electrically insulating material. The electrically insulating material is different from the material forming the support substrate. The first portion of the semi-conducting area is facing the first counter-electrode. The second portion of the semi-conducting area is facing the second counter-electrode.