Stacked Word Line Capacitor Layout for Dense NVM Bit Cells
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Solution Overview
Problem
Conventional semiconductor devices face challenges in increasing cell density and reducing manufacturing costs due to the need for channel region implants and the spatial requirements of word line capacitors, which limit the integration of more components per chip area.
Innovation Solution
A non-volatile memory (NVM) bit cell design with a stacked word line capacitor configuration, where the capacitive field plate is positioned over the gate and dielectric layer, eliminating the need for channel region implants and allowing for a smaller footprint, thereby increasing cell density and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional semiconductor device design with separate word line capacitor and channel region implant is used, then device functionality is achieved, but cell density is limited and manufacturing cost increases
Solution Approach 1:
The patent merges the word line capacitor and transistor into a stacked configuration where the capacitor is formed directly over the transistor structure. This integration eliminates the need for separate channel region implants and reduces the overall cell footprint, thereby increasing cell density while simplifying the manufacturing process
Solution Approach 2:
The patent transitions from a planar layout to a three-dimensional stacked architecture. By stacking the capacitor vertically over the transistor rather than placing it laterally adjacent, the design utilizes the vertical dimension to reduce lateral footprint and increase integration density
2Area of stationary object
If word line capacitor is placed adjacent to transistor, then device functionality is achieved, but chip area increases
Solution Approach 1:
The patent moves the capacitor from a lateral placement to a vertical stacking configuration directly over the transistor. This dimensional transition reduces the lateral area occupied by each bit cell, allowing more cells to be packed into the same chip area and thereby increasing cell density
Data Source
AI summary
A semiconductor device includes a channel region between a source region and a drain region, a gate over the channel region, a dielectric layer over the gate, a capacitive field plate over the dielectric layer, and a word line electrically coupled to the capacitive field plate.