Semiconductor Capacitor Interface Layer for Oxygen Loss
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Solution Overview
Problem
High surface energy of bottom electrodes in semiconductor capacitors leads to oxygen loss from dielectric layers, reducing capacitance and increasing leakage current, which is not effectively addressed by existing technologies.
Innovation Solution
A method for fabricating semiconductor devices with improved capacitors involves forming a bottom electrode with a high aspect ratio, followed by a sequential low-pressure plasma nitridation and high-pressure plasma oxidation process to create a uniform interface layer, reducing oxygen loss and enhancing capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bottom electrode with high surface energy is used in a capacitor, then the electrode can be formed with good adhesion and electrical properties, but oxygen is lost from the dielectric layer reducing capacitance and increasing leakage current
Solution Approach 1:
An interface layer is formed on the bottom electrode surface before depositing the dielectric layer. This preliminary action modifies the surface properties of the bottom electrode to reduce oxygen loss during subsequent dielectric layer formation and processing, thereby preventing oxygen loss while maintaining good adhesion and electrical properties
Solution Approach 2:
An interface layer is introduced as an intermediary between the bottom electrode and the dielectric layer. This interface layer acts as a barrier that prevents oxygen from the dielectric layer from being lost to the bottom electrode, while still allowing for good adhesion and electrical contact
2Strength
If a bottom electrode with high surface energy is used, then good adhesion is achieved, but leakage current increases due to oxygen loss
Solution Approach 1:
An interface layer is formed on the bottom electrode surface before depositing the dielectric layer. This preliminary action modifies the surface properties to achieve good adhesion while simultaneously reducing oxygen loss that causes leakage current
Solution Approach 2:
An interface layer is introduced as an intermediary between the bottom electrode and the dielectric layer, providing good adhesion while preventing oxygen loss that would otherwise increase leakage current
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 approach results in capacitors with low leakage current, improved capacitance, and excellent reliability by suppressing oxygen loss and stabilizing the dielectric layer, thus addressing the limitations of existing technologies.
Implementation Method 1
performing the first plasma process in an ion plasma-dominant atmosphere at a low pressure
Implementation Method 2
performing the first plasma process in a nitrogen ion plasma-dominant atmosphere
Implementation Method 3
performing the second plasma process in a radical plasma-dominant atmosphere at a high pressure
Implementation Method 4
the second plasma process may include a high-pressure plasma oxidation
Data Source
AI summary
A method for fabricating a semiconductor device includes: forming a bottom electrode of a high aspect ratio; forming an interface layer by sequentially performing a first plasma process and a second plasma process onto a surface of the bottom electrode; forming a dielectric layer over the interface layer; and forming a top electrode over the dielectric layer.