3D Semiconductor Devices with Dummy Stack Structures
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Solution Overview
Problem
Conventional two-dimensional semiconductor devices face limitations in integration density due to the need for high-priced equipment to form fine patterns, leading to restricted integration density and increased costs, prompting the development of three-dimensional semiconductor devices to enhance structural stability and integration capabilities.
Innovation Solution
The development of three-dimensional semiconductor devices with a substrate featuring a chip region, scribe line region, and a stack structure with alternately stacked layers and vertical structures that extend perpendicular to the substrate, including a cell array structure and a dummy stack structure on the scribe line region to prevent damage during substrate sawing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If three-dimensional semiconductor devices are integrated on a substrate, then integration density is improved, but structural stability during substrate sawing deteriorates
Solution Approach 1:
The patent applies preliminary action by forming a dummy stack structure on the scribe line region before the substrate sawing process. This dummy structure includes alternating insulating layers and sacrificial layers that are prepared in advance to prevent damage to the cell array structure during subsequent sawing operations. The dummy stack structure is formed simultaneously with the main stack structure through the same layer deposition processes, ensuring structural stability is established before the harmful sawing action occurs.
Solution Approach 2:
The dummy stack structure acts as an intermediary element between the cell array structure and the sawing process. It includes sacrificial layers that can be selectively removed after sawing, and insulating layers that provide mechanical support during the sawing process. This intermediary structure absorbs the mechanical stress of sawing and protects the valuable cell array structure from damage while allowing the substrate to be successfully divided.
2Manufacturing precision
If fine patterns are formed to increase integration density, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent transitions from two-dimensional planar structures to three-dimensional vertical structures by forming stack structures with multiple alternating layers extending in the vertical direction. This dimensional change allows integration density to increase through the third dimension (height) rather than requiring continuously smaller feature sizes in the planar direction, thereby reducing the need for increasingly expensive fine-patterning equipment while maintaining high integration density.
Data Source
AI summary
Three-dimensional (3D) semiconductor devices may be provided. A 3D semiconductor device may include a substrate including a chip region and a scribe line region, a cell array structure including memory cells three-dimensionally arranged on the chip region of the substrate, a stack structure disposed on the scribe line region of the substrate and including first layers and second layers that are vertically and alternately stacked, and a plurality of vertical structures extending along a vertical direction that is perpendicular to a top surface of the substrate and penetrating the stack structure.