Semiconductor Memory Device Isolation Insulating Layer Design
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Solution Overview
Problem
As semiconductor elements become highly integrated, the complexity of forming wiring lines and buried contacts increases, leading to challenges in design and reliability of semiconductor memory devices.
Innovation Solution
A semiconductor memory device design that includes a substrate with a cell region and peripheral region, featuring a cell conductive line, peripheral gate conductive layer, and an isolation insulating layer that isolates the bit line structure and peripheral gate structure, with specific spacer arrangements to enhance contact area and reduce contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If semiconductor elements are highly integrated, then the number of semiconductor elements on the same area increases, but the design rule for the components decreases and the process complexity increases
Solution Approach 1:
The substrate is divided into a cell region and a peripheral region, with different conductive line structures in each region. The cell conductive line and peripheral gate conductive layer are separately formed and isolated, allowing independent optimization of each region's wiring complexity while maintaining high integration density.
2Reliability
If multiple wiring lines and buried contacts are formed, then connectivity is improved, but the manufacturing process becomes increasingly complex and difficult
Solution Approach 1:
An isolation insulating layer is introduced as an intermediary structure between the cell conductive line and the peripheral gate conductive layer. This single layer simultaneously provides electrical isolation and structural support, simplifying the manufacturing process while ensuring proper connectivity and preventing short circuits between adjacent conductive elements.
3Reliability
If isolation between conductive elements is maintained, then reliability is improved, but device area increases
Solution Approach 1:
The isolation insulating layer is strategically positioned only where needed - between the cell conductive line and peripheral gate conductive layer - rather than uniformly across the entire device. This localized isolation approach maintains effective electrical separation while minimizing the overall device area occupied by insulating structures.
Data Source
AI summary
A semiconductor memory device may include a substrate including a cell region and a peripheral region along a periphery of the cell region; a cell region isolation layer along the periphery of the cell region in the substrate and defining the cell region; a cell conductive line on the cell region and including a sidewall on the cell region isolation layer; a peripheral gate conductive layer on the peripheral region and including a sidewall on the cell region isolation layer; and an isolation insulating layer in contact with the sidewall of the cell conductive line and the sidewall of the peripheral gate conductive layer on the cell region isolation layer.