Semiconductor Insulation Pattern for DRAM Peripheral Circuit Protection
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Solution Overview
Problem
In semiconductor device manufacturing, particularly for DRAM devices, the formation of capacitors is challenging due to the risk of damaging peripheral circuit structures as device sizes decrease, leading to potential failures during capacitor formation.
Innovation Solution
A semiconductor device design incorporating a gate structure, insulating interlayer, capping layer, wiring, insulation pattern, and etch stop layer, where the insulation pattern has a thicker lower portion and thinner lateral portion, effectively preventing the collapse of insulating interlayers and protecting peripheral circuit structures during fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the size of the DRAM device is decreased, then the integration density is improved, but the risk of damaging peripheral circuit structures during capacitor formation increases
Solution Approach 1:
The insulation pattern is formed in advance before capacitor formation processes, creating a protective structure that prevents damage to peripheral circuit structures during subsequent capacitor formation steps. This preliminary protective measure allows for reduced device size while maintaining peripheral circuit integrity.
Solution Approach 2:
The insulation pattern acts as an intermediary protective layer between the capacitor formation process and the peripheral circuit structures. It absorbs or prevents damage during capacitor formation, allowing smaller device dimensions without compromising peripheral circuit integrity.
2Reliability
If the thickness of the lateral portion of the insulation pattern is increased, then the protection of peripheral circuit structures is improved, but the manufacturing complexity increases
Solution Approach 1:
The insulation pattern has different thicknesses in different regions: a first thickness for the lower portion and a second (smaller) thickness for the lateral portion. This local variation provides adequate protection where needed while reducing manufacturing complexity and material usage in other areas.
Solution Approach 2:
The thickness parameter of the insulation pattern is varied spatially - thicker at the bottom for protection and thinner at the lateral portions for ease of manufacture. This parameter change resolves the contradiction between protection effectiveness and manufacturing simplicity.
3Area of moving object
If the insulating interlayer is made thinner to reduce device size, then the integration density is improved, but the risk of collapse during fabrication increases
Solution Approach 1:
The insulation pattern is formed preliminarily to provide structural support before and during the fabrication of the insulating interlayer. This preliminary support structure prevents collapse of thinner insulating interlayers, enabling reduced device size while maintaining stability.
Solution Approach 2:
The insulation pattern serves as an intermediary support structure that stabilizes the insulating interlayer during fabrication. It prevents collapse by providing mechanical support, allowing the insulating interlayer to be made thinner for higher integration density.
Data Source
AI summary
A semiconductor device includes a gate structure on a substrate, an insulating interlayer on the substrate and covering a sidewall of the gate structure, a capping layer on the gate structure and the insulating interlayer, a wiring on the capping layer, an insulation pattern on a bottom and a sidewall of an opening extending through the wiring and at least an upper portion of the capping layer, and an etch stop layer on the insulation pattern and the wiring. The insulation pattern includes a lower portion on the bottom of the opening and a lateral portion contacting the sidewall of the opening. A thickness of the lower portion of the insulation pattern from the bottom of the opening in a vertical direction is greater than a thickness of the lateral portion of the insulation pattern from the sidewall of the opening in a horizontal direction.