Capacitor with Aluminum Oxide and Titanium Oxynitride Layers
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Solution Overview
Problem
As semiconductor devices undergo high integration density, the variation in deposition and etching processes of thin films increases, leading to reduced reliability due to increased pattern height and aspect ratio, and decreased spacing, which affects the performance of capacitors.
Innovation Solution
A capacitor design incorporating a lower electrode, a dielectric layer of metal oxide, a diffusion-blocking aluminum oxide layer, an oxygen-donating titanium oxynitride layer, and an upper electrode, with specific thickness ranges and materials to prevent oxygen diffusion and stabilize interface characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high integration density is implemented to reduce device size and cost, then productivity and device density are improved, but manufacturing precision deteriorates due to increased pattern height and aspect ratio variations
Solution Approach 1:
The patent changes the material composition parameters of the capacitor structure by introducing specific material layers (first material layer with aluminum oxide, second material layer with titanium oxynitride) between the dielectric layer and electrodes. These material parameter changes stabilize the capacitor against process variations in deposition and etching, thereby maintaining manufacturing precision despite high integration density.
Solution Approach 2:
The patent employs a composite material structure consisting of multiple layers with different material properties: a dielectric layer (e.g., zirconium oxide, hafnium oxide), a first material layer (aluminum oxide) for oxygen blocking, and a second material layer (titanium oxynitride) for interface stabilization. This composite structure compensates for process variations and improves manufacturing precision in high-density devices.
2Area of moving object
If pattern width and spacing are decreased to increase integration density, then device size is reduced, but reliability deteriorates due to increased aspect ratio and process variation
Solution Approach 1:
The patent modifies the material parameters of the capacitor structure by incorporating specific functional layers. The first material layer (aluminum oxide) prevents oxygen diffusion, and the second material layer (titanium oxynitride) stabilizes the interface, thereby maintaining capacitor reliability even when pattern dimensions are reduced for higher integration density.
Solution Approach 2:
The patent introduces intermediary material layers between the dielectric layer and the electrodes. The first material layer acts as an oxygen diffusion barrier, and the second material layer serves as an interface stabilizer. These intermediary layers protect the capacitor from degradation mechanisms that become more pronounced at reduced pattern dimensions, thereby maintaining reliability.
3Device complexity
If conventional capacitor structure is used in highly integrated devices, then device complexity is minimized, but reliability deteriorates due to oxygen diffusion and interface instability
Solution Approach 1:
The patent employs a composite material structure with functionally differentiated layers: a dielectric layer for capacitance, a first material layer (aluminum oxide) for oxygen diffusion blocking, and a second material layer (titanium oxynitride) for interface stabilization. This composite approach enhances reliability by addressing specific failure mechanisms while maintaining reasonable structural complexity.
Solution Approach 2:
The patent applies local quality by assigning specific functions to different material layers at different locations within the capacitor structure. The first material layer is positioned where oxygen diffusion is most problematic (between dielectric and electrode), and the second material layer is positioned at the interface where stability is critical. This localized functional assignment improves reliability without uniformly increasing complexity throughout the entire device.
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 design enhances the reliability and electrical characteristics of capacitors by preventing oxygen loss and maintaining stable interface properties, improving the overall performance of highly integrated semiconductor devices.
Implementation Method 1
The first material layer may be a diffusion blocking layer that prevents diffusion of oxygen atoms from the dielectric layer to the lower electrode
Implementation Method 2
The second material layer may be an oxygen donating layer that donates oxygen atoms to the upper electrode
Data Source
AI summary
A capacitor in a semiconductor device may include a lower electrode, a dielectric layer including a metal oxide and disposed on the lower electrode, a first material layer including aluminum oxide (AlxOy) and disposed on the dielectric layer, a second material layer including titanium oxynitride (TixOyNz) and disposed on the first material layer, and an upper electrode disposed on the second material layer, wherein the first material layer is between the dielectric layer and the second material layer, and the dielectric layer is between the lower electrode and the first material layer.