Trench Capacitor in Memory Substrate for Integration
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Solution Overview
Problem
Current memory structures face challenges in increasing the capacitance of capacitors to enhance electrical performance and integration, particularly in semiconductor memory devices.
Innovation Solution
The implementation of a trench capacitor structure within a substrate, connected between two transistors, which includes electrodes and dielectric layers, and a parallel capacitor configuration to enhance capacitance, allowing for improved electrical performance and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional capacitor structure is used in memory devices, then the device can be manufactured with standard processes, but the capacitance value is insufficient to improve electrical performance
Solution Approach 1:
The patent embeds the capacitor structure within the substrate by forming a trench and placing capacitor electrodes and dielectric layers inside it. This nesting approach allows the capacitor to be integrated within the existing substrate area without occupying additional external space, thereby increasing capacitance while maintaining compact device geometry and standard manufacturing processes.
Solution Approach 2:
The patent transitions from a planar capacitor configuration to a three-dimensional structure by forming a trench in the substrate and placing capacitor elements vertically within it. This dimensional change from 2D to 3D space utilization increases the effective capacitance by utilizing the vertical dimension and internal substrate volume, thereby improving electrical performance without increasing the device footprint.
2Reliability
If the capacitor size is increased to improve capacitance, then the electrical performance improves, but the device area and integration density deteriorate
Solution Approach 1:
The capacitor is nested within the substrate by forming a trench and placing capacitor electrodes and dielectric layers inside the substrate volume. This approach increases capacitance by utilizing internal substrate space rather than expanding the external device area, thereby improving electrical performance while maintaining high integration density and small device footprint.
Solution Approach 2:
The patent employs a three-dimensional capacitor structure formed within a trench in the substrate, transitioning from planar to vertical configuration. This dimensional change allows the capacitor to utilize the vertical dimension and internal volume of the substrate, increasing capacitance without proportionally increasing the device area, thus improving electrical performance while maintaining compact integration.
3Reliability
If a trench capacitor structure is implemented to increase capacitance, then the electrical performance and integration are improved, but the manufacturing process complexity increases
Solution Approach 1:
The capacitor structure is segmented into distinct components: trench formation, first electrode deposition, dielectric layer deposition, and second electrode deposition. Each segment can be processed separately using standard semiconductor fabrication techniques, allowing the complex trench capacitor structure to be manufactured through a series of manageable steps that integrate with existing manufacturing processes.
Solution Approach 2:
The trench capacitor structure serves multiple functions: it provides the required capacitance for electrical performance, utilizes substrate space for integration, and can be formed using standard semiconductor processing techniques. The same trench formation and layer deposition processes can be applied across different memory device types, making the solution universally applicable and reducing overall manufacturing complexity.
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 effectively increases the capacitance of the capacitor, leading to improved electrical performance and integration of the memory device while maintaining a small size.
Implementation Method 1
The trench capacitor may include a first electrode, a second electrode, a first dielectric layer, and a second dielectric layer. The second dielectric layer is located between the second electrode and the first electrode
Implementation Method 2
The second dielectric layer is located between the second electrode and the first electrode and between the second electrode and the substrate
Data Source
AI summary
A memory structure including a substrate, a first transistor, a second transistor, and a trench capacitor is provided. The trench capacitor is disposed in the substrate and is connected between the first transistor and the second transistor.