Semiconductor Memory Contact Plug Capping Pattern for Metal Migration
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Solution Overview
Problem
The challenge in developing semiconductor memory devices is to create reliable, high-speed, low-power devices with improved integration and manufacturing efficiency, as existing technologies face difficulties in achieving these requirements due to the complexity of highly integrated semiconductor memory devices.
Innovation Solution
The semiconductor memory device design includes a mold dielectric layer on a substrate with a contact plug and a variable resistor, where the contact plug's upper surface is at or below the mold dielectric layer's surface, and the variable resistor's upper surface is at or below the contact plug's surface, with a capping pattern formed on the contact plug to prevent metal atoms from migrating during the formation of mold openings, ensuring reliable operation and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact plug upper surface is positioned at or below the mold dielectric layer surface to prevent metal atom migration, then device reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The contact plug is formed with its upper surface positioned at or below the mold dielectric layer surface before the mold opening formation process begins. This preliminary positioning prevents metal atom migration during subsequent processing steps, as the contact plug is already in a protected state before any high-temperature or plasma processing occurs.
Solution Approach 2:
The mold dielectric layer serves as an intermediary barrier between the contact plug and the mold opening. By positioning the contact plug surface at or below the mold dielectric layer surface, the dielectric layer acts as a protective medium that prevents direct exposure and potential metal atom migration while still allowing electrical functionality.
2Productivity
If highly integrated semiconductor memory devices are manufactured to achieve higher speed and lower power consumption, then performance is improved, but manufacturing complexity increases
Solution Approach 1:
The semiconductor memory device is segmented into distinct functional regions including cell regions with variable resistors and contact plugs, and pad regions with bonding pads. This segmentation allows each region to be optimized independently for its specific function while maintaining overall device integration, thereby managing manufacturing complexity through modular design.
Solution Approach 2:
The mold dielectric layer serves multiple functions simultaneously: it provides electrical isolation, defines the surface level for contact plug positioning, acts as a protective barrier during processing, and serves as a structural element in the overall device architecture. This multi-functionality reduces the number of separate components needed, simplifying manufacturing despite high integration.
Data Source
AI summary
According to a method of fabricating the semiconductor memory device, a contact plug can be protected while mold openings are formed. A semiconductor memory device may include a mold dielectric layer on an entire surface of a substrate, the substrate including a first region and a second region. A contact plug may be provided in a contact hole formed through the mold dielectric layer in the first region. A variable resistor may be provided in a mold opening formed through the mold dielectric layer in the second region. An upper surface of the contact plug may be at a level equal to or lower than an upper surface of the mold dielectric layer.