Embedded Memory FinFET Chip Layout for Density and Bandwidth
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Solution Overview
Problem
The semiconductor industry faces challenges in achieving high 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 transistor (FinFET) structures with multiple fin structures on a semiconductor substrate, using photolithography and etching processes to create recesses and isolation features, followed by the deposition of dielectric and gate materials, and replacing dummy gate stacks with metal gate stacks to enhance device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If repeated reductions in minimum feature size are used to improve integration density, then more components can be integrated into a given area, but manufacturing precision and process control become increasingly difficult
Solution Approach 1:
The patent transitions from planar 2D transistor structures to three-dimensional FinFET structures with vertical fins extending from the substrate. This dimensional change allows current flow control in multiple directions (vertical through fins and horizontal through channels), enabling higher integration density while maintaining manufacturable feature sizes through the vertical dimension rather than continuous lateral scaling
Solution Approach 2:
The semiconductor substrate is divided into multiple discrete fin structures arranged in arrays, with each fin acting as an independent current conduction path. This segmentation allows parallel processing and scaling - more fins can be packed into the same area without requiring proportional reduction in individual fin dimensions, thus maintaining manufacturing precision while increasing overall integration density
2Speed
If miniaturization is pursued to achieve higher speed and greater bandwidth, then component size decreases, but power consumption and latency requirements become harder to meet
Solution Approach 1:
The FinFET structure introduces vertical current flow paths through the fin height dimension, enabling faster signal transmission without proportionally reducing the horizontal channel length. The vertical fins provide additional conduction pathways that reduce resistance and improve bandwidth while the three-dimensional geometry allows better electrostatic control, reducing leakage current and power consumption compared to planar structures
Solution Approach 2:
The patent employs composite material structures including semiconductor fins embedded in dielectric materials, with multiple layers of conductive and insulating materials forming the FinFET architecture. This composite structure optimizes electrical properties for high-speed operation while controlling power consumption through material selection and layer configuration
3Quantity of substance
If embedded memory cells are added to meet demand for higher bandwidth, then memory capacity increases, but device complexity and fabrication process difficulty increase
Solution Approach 1:
The patent merges logic circuitry and memory cell arrays into a unified FinFET-based architecture where both functions utilize the same three-dimensional fin structures and fabrication processes. This consolidation allows embedded memory to be implemented without requiring separate fabrication lines or significantly different process steps, managing complexity while achieving high memory capacity through shared structural elements
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.