Multi-layer Passivation for Variable Resistance Element Sidewalls
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Solution Overview
Problem
Existing semiconductor devices face challenges in maintaining the reliability of variable resistance elements due to oxidation and residue issues during the patterning process, leading to degradation of characteristics such as increased resistance and electrical shorts.
Innovation Solution
A multi-layer passivation layer with insulating layers formed through deposition and post-treatment processes, including plasma treatment with H2 and N2, is applied to the sidewalls of variable resistance elements to reduce oxidation and impurities, forming a reduction region and improving the film quality and stress balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer passivation layer is formed over sidewalls of variable resistance element, then the structure is simple and manufacturing is easy, but oxidation and residue issues occur during patterning leading to increased resistance and electrical shorts
Solution Approach 1:
The passivation layer is divided into multiple layers (first passivation layer and second passivation layer) with different materials and functions. The first passivation layer uses a material with high etch selectivity to protect the variable resistance element during patterning, while the second passivation layer provides additional protection and stress management. This segmentation resolves the contradiction by improving reliability through functional differentiation while maintaining manufacturing feasibility through systematic process design.
Solution Approach 2:
The patent employs composite material structure where the first passivation layer and second passivation layer are made of different materials with complementary properties. The first passivation layer material is selected for high etch selectivity against the variable resistance element, while the second passivation layer material provides enhanced mechanical protection and stress balance. This composite approach improves reliability by addressing multiple failure modes simultaneously.
2Manufacturing precision
If multiple deposition processes are performed to form multi-layer passivation layer, then film quality and stress balance are improved, but manufacturing time and process complexity increase
Solution Approach 1:
The first passivation layer is formed before the second passivation layer, with each layer performing a specific function in advance. The first layer is deposited and processed to establish etch selectivity protection, then the second layer is added for enhanced protection. This preliminary action approach improves manufacturing precision by ensuring each layer is optimized for its specific function while maintaining overall process efficiency.
Solution Approach 2:
The patent utilizes different deposition parameters and material compositions for each passivation layer to optimize film quality. By changing material parameters and deposition conditions between layers, the patent achieves superior film quality and stress balance. This parameter change strategy improves manufacturing precision while managing process time through targeted optimization rather than uniform processing.
3Manufacturing precision
If plasma treatment with H2 and N2 is performed for post-treatment, then oxidation and impurities are reduced improving film quality, but process time and energy consumption increase
Solution Approach 1:
The plasma treatment process uses controlled oxidation during deposition to form a protective oxide layer on the variable resistance element sidewalls, then subsequent hydrogen plasma reduces this oxide layer to remove impurities and improve film quality. This converts the potentially harmful oxidation into a beneficial protective step, then eliminates the unwanted oxide. This approach improves manufacturing precision while managing energy consumption through a two-step process that leverages chemical transformations.
Solution Approach 2:
The patent employs plasma treatment with specific gas compositions (H2 and N2) to accelerate oxidation and impurity removal processes. The plasma state provides highly reactive species that rapidly oxidize and then reduce surface impurities, improving film quality more efficiently than thermal processes. This accelerated oxidation approach improves manufacturing precision while controlling energy consumption through optimized plasma parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multi-layer passivation layer enhances the reliability of variable resistance patterns by reducing film leakage current and preventing degradation, resulting in improved performance and integration reliability of semiconductor devices.
Implementation Method 1
Each of the two or more insulating layers may be a thin film formed through a deposition and a post-treatment. Among the two or more insulating layers of the multi-layer passivation layer, a first insulating layer of the multi-layer passivation layer may have a first impurity concentration higher than a second impurity concentration of a second insulating layer positioned closer than the first insulation layer to the variable resistance element.
Implementation Method 2
Each of the two or more insulating layers may be a thin film formed through a deposition and a post-treatment.
Data Source
AI summary
An electronic device includes a semiconductor memory, wherein the semiconductor memory includes a variable resistance element formed over a substrate, and a multi-layer passivation layer positioned over sidewalls of the variable resistance element and having two or more insulating layers formed over the sidewalls of the variable resistance element.