MIM Capacitor Straining Layer for High-k Crystallization
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Solution Overview
Problem
The increasing complexity and miniaturization of semiconductor integrated circuits (ICs) pose challenges in processing and manufacturing, particularly in achieving high capacitance density in metal-insulator-metal (MIM) capacitors, which are crucial for advanced semiconductor devices.
Innovation Solution
The fabrication method involves forming a straining layer on an electrode, followed by a high-k dielectric layer, which enhances the crystallization of the insulator layer without requiring an extra annealing process, resulting in increased dielectric constant and capacitance density in MIM capacitors. Additionally, stacked MIM capacitors with symmetrically arranged insulator and straining layers are used to further improve capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional MIM capacitor fabrication is used, then manufacturing process is simpler, but capacitance density is insufficient for advanced semiconductor devices
Solution Approach 1:
A straining layer is formed on the electrode surface before depositing the insulator layer. This preliminary action modifies the substrate surface properties to enhance subsequent insulator layer crystallization, achieving high capacitance density without requiring complex post-deposition annealing processes.
Solution Approach 2:
The invention changes the physical and chemical parameters of the electrode surface by introducing a straining layer with specific crystallographic orientation and strain characteristics. This parameter modification promotes epitaxial growth of the insulator layer, significantly increasing the dielectric constant and capacitance density.
2Quantity of substance
If insulator layer crystallization is enhanced through conventional annealing, then dielectric constant increases, but manufacturing process complexity and cost increase
Solution Approach 1:
Instead of applying post-deposition annealing treatment, the invention performs preliminary surface modification by forming a straining layer before insulator deposition. This preliminary action creates favorable growth conditions that enable crystallization during standard deposition processes, eliminating the need for separate annealing steps.
Solution Approach 2:
The invention extracts and eliminates the separate annealing process step from the fabrication sequence. By incorporating the crystallization-promoting function into the straining layer formation step, the complex thermal processing is removed while maintaining or enhancing dielectric constant.
3Productivity
If geometric size is reduced to increase functional density, then device integration improves, but manufacturing precision requirements increase
Solution Approach 1:
The invention changes the crystallographic parameters and surface energy characteristics of the electrode through straining layer formation. This enables precise control of insulator layer growth orientation and thickness, maintaining high manufacturing precision even as device dimensions are reduced to increase functional density.
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
This approach leads to improved capacitance density and structural integrity of MIM capacitors, enabling better performance in memory elements and non-volatile computer memory cells, while reducing manufacturing complexity and costs.
Implementation Method 1
a straining layer formed on an electrode, and a high-k dielectric layer as an insulator layer formed on the straining layer. The straining layer allows the insulator layer to be highly crystallized
Implementation Method 2
MIM capacitors exhibit improved frequency and temperature characteristics. Furthermore, MIM capacitors are formed in or over the metal interconnect layers
Data Source
AI summary
Embodiments of present disclosure provide a MIM capacitor including a straining layer on an electrode, and a high-k dielectric layer formed on the straining layer. The straining layer allows the high-k dielectric layer to be highly crystallized without requiring an extra annealing process. The high crystallization of the high-k dielectric layer results in increased the dielectric value (k-value), thus, improving capacitance density in the MIM capacitor. Some embodiments provide a MIM capacitor device including stacked MIM capacitors with symmetrically arranged high-k dielectric layers and straining layers.