Memory Cell Insulating Structure for Leakage and Short Prevention
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Solution Overview
Problem
As semiconductor technology advances, reducing device sizes and distances between elements leads to challenges in precise control and increased leakage current in memory cells, particularly in memory devices like DRAM, necessitating an improved insulation structure to enhance electrical insulation and reliability.
Innovation Solution
A memory device with a dual-work-function gate electrode framework and a specific electrical insulating structure comprising multiple dielectric layers, where the insulating structure is trimmed and covered by a capping layer to protect it from damage during manufacturing, ensuring efficient electrical insulation and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If device dimensions and distances between elements are reduced to increase device density, then device density is improved, but manufacturing precision and control of dimensions deteriorate
Solution Approach 1:
The electrical insulating structure is divided into multiple segments: a first insulating layer lining the substrate sidewall, a second insulating layer over the first gate electrode, and a third insulating layer over the second gate electrode. This segmentation allows each layer to be precisely controlled independently, maintaining manufacturing precision while achieving high device density through compact spacing.
Solution Approach 2:
The patent introduces a vertical dimension to the insulating structure by creating a recessed region in the substrate and stacking multiple insulating layers at different heights. The slope extending from the substrate to the second gate electrode utilizes the vertical dimension to maintain insulation effectiveness while reducing horizontal spacing between elements, thereby increasing device density without sacrificing manufacturing precision.
2Quantity of substance
If device size is reduced to improve device density, then device density is improved, but leakage current increases
Solution Approach 1:
The electrical insulating structure is divided into multiple segments: a first insulating layer lining the substrate sidewall, a second insulating layer over the first gate electrode, and a third insulating layer over the second gate electrode. This segmentation allows each layer to be precisely controlled independently, maintaining manufacturing precision while achieving high device density through compact spacing.
Solution Approach 2:
The insulating structure is concentrated in the local region between adjacent memory cells where leakage current is most problematic. The recessed electrical insulating structure with multiple dielectric layers provides enhanced local insulation quality at critical interfaces, effectively blocking leakage current paths while allowing the rest of the device to maintain small dimensions for high density.
3Quantity of substance
If distances between elements are reduced to improve device density, then device density is improved, but electrical insulation deteriorates
Solution Approach 1:
The electrical insulating structure is divided into multiple segments: a first insulating layer lining the substrate sidewall, a second insulating layer over the first gate electrode, and a third insulating layer over the second gate electrode. This segmentation allows each layer to be precisely controlled independently, maintaining manufacturing precision while achieving high device density through compact spacing.
Solution Approach 2:
The insulating structure employs a nested configuration where the second insulating layer is positioned within the horizontal footprint of the first insulating layer, and the third insulating layer is positioned within the footprint of the second insulating layer. This nested arrangement creates multiple concentric insulation barriers between adjacent memory cells, providing robust electrical insulation even when horizontal distances are reduced to increase device density.
Data Source
AI summary
The present disclosure provides a memory device. The memory device includes a substrate, a first gate electrode arranged within the substrate, a second gate electrode arranged within the substrate and over the first gate electrode, and an electrical insulating structure separating the substrate, the first gate electrode and the second gate electrode from one another. The memory device further includes a first dielectric layer arranged within the substrate and covering an upper portion of the electrical insulating structure from a top-view perspective.