Variable Resistance Memory Matrix Spacer Contact Alignment
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Solution Overview
Problem
Current semiconductor devices face challenges in miniaturization, low power consumption, and high performance due to limitations in the design and fabrication of memory circuits, particularly in the integration and functionality of variable resistance elements in electronic devices.
Innovation Solution
The proposed electronic device incorporates a substrate with variable resistance elements arranged in a matrix, surrounded by spacer patterns that define contact holes for source line contacts, utilizing nitride materials and specific structural configurations to enhance the characteristics and integration of these elements within the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If variable resistance elements are arranged in a matrix type with close spacing to increase integration density, then device functionality and storage capacity are improved, but manufacturing precision and alignment accuracy deteriorate due to difficulty in forming precise contact holes between adjacent elements
Solution Approach 1:
The spacer pattern is formed in advance before contact hole formation, serving as a pre-positioned guide structure that defines the exact location and dimensions of future contact holes. This preliminary action ensures that contact holes are automatically aligned with the desired positions between variable resistance elements, eliminating alignment issues during subsequent manufacturing steps.
Solution Approach 2:
The spacer pattern acts as an intermediary structure between the variable resistance elements and the contact holes. It surrounds the variable resistance elements and defines the contact hole regions, mediating the spatial relationship and ensuring precise positioning without requiring direct alignment between distant features.
2Reliability
If the thickness of spacer patterns is increased to adequately cover spaces between variable resistance elements, then structural reliability and contact hole definition are improved, but device area and layer complexity increase
Solution Approach 1:
The spacer pattern is applied locally around each variable resistance element rather than as a universal thick layer across the entire device. The thickness is specifically optimized to cover the spaces between adjacent elements where contact holes need to be formed, providing structural reliability only where needed without adding unnecessary complexity elsewhere in the device structure.
Data Source
AI summary
Provided is an electronic device including a semiconductor memory. The semiconductor memory may include: a substrate; a plurality of variable resistance elements formed over the substrate and arranged as a matrix, spacer patterns formed over the substrate to surround the variable resistance elements in the matrix with a thickness sufficient to define contact holes between the variable resistance elements, and a source line contact buried in the contact hole.