Semiconductor Memory Support Patterns for Capacitor Reliability
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Solution Overview
Problem
Current semiconductor memory devices face challenges in increasing integration density and reliability, particularly in enhancing capacitor capacitance and the aspect ratio of the lower electrode to meet demands for lightweight, small-sized, high-speed, multifunctional, and cost-effective devices.
Innovation Solution
A semiconductor memory device is fabricated with a supporting pattern comprising layers of materials with etch selectivity, where one layer is deposited at a slower rate and includes a carbon-nitrogen compound, and the other at a faster rate, exhibiting tensile and compressive stress characteristics, to support vertically oriented capacitor storage nodes and improve productivity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance of the capacitor or the aspect ratio of the lower electrode is increased to improve reliability, then the integration density and performance are enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The supporting pattern is divided into multiple layers (first supporting pattern layer and second supporting pattern layer) with different materials and functions. The first layer provides mechanical support while the second layer provides etch selectivity, allowing the capacitor structure to achieve high aspect ratios without compromising manufacturing feasibility or increasing overall device complexity
Solution Approach 2:
The first supporting pattern layer acts as an intermediary between the lower electrode and the surrounding structures. By introducing this intermediate layer with specific mechanical properties (tensile or compressive stress), the structure can maintain integrity during fabrication processes without requiring complex design modifications
2Ease of manufacture
If a single-layer supporting pattern is used, then the manufacturing process is simpler, but the structural integrity and etch selectivity are insufficient
Solution Approach 1:
The supporting pattern uses composite material structure with at least two different materials: one providing mechanical support (tensile/compressive stress) and another providing etch selectivity. This composite approach enables precise control of storage node integrity during fabrication without significantly complicating the manufacturing process
Solution Approach 2:
Different regions of the supporting pattern have different material compositions tailored to local requirements: the first supporting pattern layer is optimized for mechanical support at the base, while the second supporting pattern layer is optimized for etch selectivity during subsequent fabrication steps, ensuring manufacturing precision without uniform complexity throughout
3Productivity
If materials with different deposition rates are used in the supporting pattern, then the productivity is improved, but the manufacturing precision and uniformity may be affected
Solution Approach 1:
The patent employs materials with different deposition rates in different layers of the supporting pattern, optimizing the deposition parameters for each material type. The first supporting pattern layer uses materials deposited at one rate optimized for mechanical properties, while the second layer uses materials deposited at a different rate optimized for etch selectivity, maintaining overall manufacturing precision through parameter optimization
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 solution enhances the reliability and productivity of semiconductor memory devices by maintaining the structural integrity of storage nodes and enabling improved deposition processes, reducing product failures and enhancing integration density.
Implementation Method 1
the first pattern can include a material having an etch selectivity with respect to the second pattern
Implementation Method 2
the first pattern can include a material that is deposited at a first deposition rate and the second pattern can include a material that is deposited at a second deposition rate, where the first deposition rate is less than the second deposition rate
Implementation Method 3
one of the pair of the first patterns can include a material that exhibits a tensile stress characteristic and the other of the pair can include a material that exhibits a compressive stress characteristic
Data Source
AI summary
A capacitor dielectric can be between the storage node and the electrode layer. A supporting pattern can be connected to the storage node, where the supporting pattern can include at least one first pattern and at least one second pattern layered on one another, where the first pattern can include a material having an etch selectivity with respect to the second pattern.