Electrical Device for ALD Characterization via 3D Structures
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Solution Overview
Problem
Current methods for characterizing atomic layer deposition (ALD) steps in 3D capacitors are inefficient, as they rely on costly and time-consuming Transmission Electron Microscopy (TEM) for conformality analysis, which provides limited information and is not reproducible, and existing methods do not fully account for the electrical properties of the deposited layers.
Innovation Solution
An electrical device with distinct 3D structures and conductive layers is used to perform electrical characterization, allowing for the measurement of parameters like capacitance and resistance, which provides a more comprehensive and reproducible assessment of the deposition step's conformality and material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Transmission Electron Microscopy (TEM) is used to characterize ALD deposition steps, then morphological information and conformality analysis are obtained, but the method is too long, expensive, difficult, and provides poor resolution with limited information
Solution Approach 1:
The patent replaces the mechanical/physical TEM analysis system with an electrical characterization system. Instead of using electron microscopy to physically examine deposited layers, the invention uses electrical measurements (capacitance, resistance, leakage current) to indirectly characterize the deposition quality. This substitution transforms a complex physical analysis method into a simpler electrical measurement approach that is faster, cheaper, and equally effective for assessing ALD deposition conformality and quality.
Solution Approach 2:
The patent introduces electrical properties (capacitance, resistance, leakage current) as intermediary parameters to characterize deposition quality. Rather than directly observing morphological features through TEM, the invention uses electrical measurements as mediators that reflect the underlying deposition quality. These electrical properties serve as proxies that correlate with conformality and material quality, enabling indirect but effective characterization without the complexities of TEM.
2Loss of information
If TEM is used for characterization, then physical and chemical properties are analyzed, but the method is expensive and difficult to perform
Solution Approach 1:
The patent replaces the complex TEM analysis system with standard electrical measurement equipment. Instead of requiring expensive electron microscopes and specialized preparation procedures, the invention uses conventional electrical characterization tools to obtain comprehensive information about deposition quality. This substitution maintains information completeness while dramatically improving ease of manufacture and accessibility.
Solution Approach 2:
The patent changes the measurement parameters from physical/morphological (requiring TEM) to electrical properties (capacitance, resistance, leakage current). This parameter transformation enables the same characterization goals to be achieved using simpler, more accessible equipment. The electrical parameters provide equivalent or superior information about deposition quality compared to morphological analysis, while being much easier to measure.
3Manufacturing precision
If conformal deposition is achieved in 3D structures, then full use of 3D shapes is made, but ALD steps may still produce defective capacitors with unexpected capacitance values
Solution Approach 1:
The patent implements electrical characterization as a feedback mechanism to monitor and validate deposition quality. By measuring capacitance, resistance, and leakage current, the system provides feedback about the actual functional quality of deposited layers. This feedback goes beyond simple conformality assessment to directly evaluate whether the deposition produced functionally reliable structures, enabling real-time process optimization and defect prevention.
Solution Approach 2:
The patent replaces morphological analysis (which only assesses shape conformity) with electrical characterization (which assesses functional quality). Instead of relying on visual inspection of conformality, the invention uses electrical measurements that directly reflect the functional performance of the deposited layers. This substitution ensures that deposition quality is evaluated based on actual device functionality rather than just geometric appearance.
4Measurement precision
If membrane removal is performed to allow visual analysis of cavity, then morphological information is obtained, but the process is hazardous and leads to difficulties during post processing
Solution Approach 1:
The patent replaces the mechanical membrane removal and visual analysis process with electrical characterization. Instead of physically removing membranes to examine cavities (which creates hazards and processing difficulties), the invention uses electrical measurements to non-invasively assess deposition quality. This substitution eliminates the harmful mechanical intervention while providing equivalent or superior information about the deposited structures.
Solution Approach 2:
The patent introduces electrical properties as intermediary measurement parameters that can be obtained without physical intervention. Rather than requiring membrane removal to access morphological information, the invention uses electrical measurements as intermediaries that can be taken through existing structures. This approach provides the needed information while avoiding the hazards and complications of membrane removal.
Data Source
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AI summary
The invention concerns an electrical device for characterizing at least one deposition step, the device comprising a first electrical component (110A) and a second electrical component (110B) comprising respectively a first portion (103A) and a second portion (103B) of a conductive layer (102), the first electrical component comprising a first 3D structure (105A) comprising at least one first opening (107A) extending in a layer comprising an insulating material, the second electrical component comprising a second 3D structure (105B) comprising at least one second opening (107B) extending in a layer comprising an insulating material. The two 3D structures have different shapes so as to allow characterizing the deposition step. The invention also concerns a method of fabricating and a method of characterizing.