Stop Segment Structure for Planar Logic-Memory Connection Regions
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Solution Overview
Problem
The challenge in semiconductor manufacturing lies in achieving uniform thickness and planarity of insulating layers in complex integrated circuits, particularly in regions transitioning from logic to memory cell areas, which affects device performance and reliability.
Innovation Solution
Incorporating a stop segment within the insulating layers, specifically a composite material with different sub-layers, to maintain uniformity and planarity by acting as a polish and etch stop during fabrication processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If insulating layers are formed in complex integrated circuits with transitions from logic to memory cell areas, then device functionality is achieved, but uniform thickness and planarity become difficult to maintain
Solution Approach 1:
The patent divides the insulating layer structure into multiple segments including a first insulating layer, a second insulating layer, and a stop segment positioned between them. This segmentation allows each layer to be optimized independently for thickness and planarity control in different circuit regions, resolving the contradiction between achieving complex device functionality and maintaining manufacturing precision.
Solution Approach 2:
The stop segment acts as an intermediary element between the first and second insulating layers. It provides a controlled interface that facilitates uniform thickness and planarity maintenance during fabrication processes, enabling the overall structure to achieve both functional adaptability and manufacturing precision.
2Reliability
If complex integrated circuits are manufactured with multiple insulating layers, then device performance is enhanced, but fabrication process complexity increases
Solution Approach 1:
The patent applies local quality by positioning the stop segment specifically in connection regions between logic and memory cell areas, while other regions may have different insulating layer configurations. This localized approach enhances device performance in critical areas without unnecessarily increasing fabrication complexity across the entire wafer.
Solution Approach 2:
The patent utilizes parameter changes by varying the material composition and physical properties of different insulating layers and the stop segment. These parameter variations enable optimized device performance while providing distinct etch and polish characteristics that simplify the fabrication process through better process control.
3Reliability
If insulating layers are made thicker to ensure adequate isolation, then device reliability improves, but planarity and thickness uniformity become harder to control
Solution Approach 1:
The patent segments the total insulating thickness into multiple thinner layers (first insulating layer, second insulating layer) separated by a stop segment. This segmentation achieves adequate total isolation for reliability while maintaining better thickness uniformity and planarity control for each individual layer, resolving the contradiction between reliability and manufacturing precision.
Solution Approach 2:
The patent introduces a vertical dimension solution by stacking multiple insulating layers with the stop segment positioned between them. This multi-layer vertical structure provides adequate isolation thickness for reliability while each individual layer maintains controlled thickness and planarity, overcoming the limitations of a single thick layer approach.
Data Source
AI summary
Provided is a semiconductor device includes a gate electrode, a gate dielectric layer, a channel layer, an insulating layer, a first source/drain electrode and a second source/drain electrode, a second dielectric layer, and a stop segment. The gate electrode is located within a first dielectric layer that overlies a substrate. The gate dielectric layer is located over the gate electrode. The channel layer is located on the gate dielectric layer. The insulating layer is located over the channel layer. The first source/drain electrode and the second source/drain electrode are located in the insulating layer, and connected to the channel layer. The second dielectric layer is beside one of the first source/drain electrode and the second source/drain electrode. The stop segment is embedded in the second dielectric layer.