Embedded Memory FinFET Chip Layout for High-Density Low-Power Scaling
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Solution Overview
Problem
The semiconductor industry faces challenges in achieving higher integration density, lower power consumption, and faster speeds due to limitations in miniaturization and bandwidth, particularly in the fabrication of semiconductor chips with embedded memory cells.
Innovation Solution
The process involves forming fin-type field-effect transistors (FinFETs) with multiple fin structures on a semiconductor substrate, using photolithography and etching processes to create recesses, and depositing dielectric and gate materials to form metal gate stacks, along with the integration of memory devices within interlayer dielectric layers and interconnect wirings to enhance integration density and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If minimum feature size is reduced to increase integration density, then more components can be integrated into a given area, but manufacturing precision and reliability become more difficult to maintain
Solution Approach 1:
The patent transitions from planar 2D transistor structures to 3D FinFET structures with vertical fins extending from the substrate. This dimensional change allows current flow control in three dimensions, enabling higher integration density while maintaining manufacturability through self-aligned fabrication processes that reduce precision requirements at each step.
Solution Approach 2:
The patent divides the continuous substrate into multiple discrete fin structures separated by isolation regions. Each fin acts as an independent current channel, allowing parallel operation of multiple transistors. This segmentation enables scaling to higher densities while maintaining control over each individual fin's dimensions through standardized fabrication steps.
2Quantity of substance
If feature size is reduced to increase integration density, then more memory cells can be packed, but power consumption and latency increase
Solution Approach 1:
The FinFET's vertical fin structure provides enhanced gate control over the channel in the third dimension, improving carrier modulation efficiency. This results in lower off-state leakage currents and reduced static power consumption, allowing high-density memory arrays to operate at lower power levels despite increased component count.
Solution Approach 2:
The patent modifies the transistor's geometric parameters by creating high aspect-ratio vertical fins with controlled widths and heights. This parameter change increases the gate-to-channel control ratio, improving switching efficiency and reducing the energy required for each memory cell operation, thereby lowering overall power consumption in high-density configurations.
3Quantity of substance
If more memory cells are integrated to increase capacity, then bandwidth and speed requirements increase, but conventional fabrication methods become insufficient
Solution Approach 1:
The fabrication process is segmented into modular stages: fin formation through self-aligned etching, separate gate stack deposition, and distinct interlayer dielectric processing. Each module can be independently optimized and controlled, managing overall process complexity while enabling mass production of high-capacity memory chips with consistent performance.
Solution Approach 2:
The adoption of 3D FinFET structures requires updated fabrication methodologies including anisotropic etching for vertical fin creation and multi-layer gate stack formation. These dimensional changes, while increasing process steps, provide superior device performance and scalability that conventional 2D planar processes cannot achieve at high integration densities.
4Productivity
If fin structures are created to improve transistor performance, then integration density increases, but manufacturing precision requirements increase
Solution Approach 1:
The fabrication process uses preliminary sacrificial layer deposition and self-aligned patterning steps that pre-defin fin locations and dimensions before the actual fin formation etch. This preliminary structuring ensures precise fin geometry and spacing without requiring ultra-precise direct patterning, reducing manufacturing precision requirements while maintaining high transistor performance.
Solution Approach 2:
The self-aligned fabrication process allows previously deposited layers to automatically define the positions and dimensions of subsequent structures. The sacrificial layers and spacer formations serve their own patterning function, eliminating the need for separate high-precision lithography alignment steps and reducing overall manufacturing precision demands while achieving consistent fin structures for high-performance transistors.
Data Source
AI summary
A semiconductor chip including a semiconductor substrate, an interconnect structure and a memory cell array is provided. The semiconductor substrate includes a logic circuit. The interconnect structure is disposed on the semiconductor substrate and electrically connected to the logic circuit, and the interconnect structure includes stacked interlayer dielectric layers and interconnect wirings embedded in the stacked interlayer dielectric layers. The memory cell array is embedded in the stacked interlayer dielectric layers. The memory cell array includes driving transistors and memory devices, and the memory devices are electrically connected the driving transistors through the interconnect wirings.