Carbon Nanotube Stack Thinning for Aligned Semiconductor Channels
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Solution Overview
Problem
As semiconductor manufacturing continues to shrink feature sizes, challenges arise in integrating and aligning carbon nanotubes for high-density, pure layers in semiconductor devices, requiring efficient deposition and alignment methods to enhance integration density and device performance.
Innovation Solution
A vacuum system with a filter and electrostatic field is used to deposit and align carbon nanotubes, employing a combination of passive and active electrostatic field generation and surfactant introduction to align and purify the nanotubes, followed by controlled thinning processes to form high-density, pure layers for semiconductor device fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional deposition methods are used to deposit carbon nanotubes, then the deposition process is simple, but the alignment and purity of nanotube layers are insufficient
Solution Approach 1:
A filter membrane is introduced as an intermediary substrate to deposit carbon nanotubes. The filter membrane serves as a mediator that enables precise alignment and high-purity nanotube layer formation through controlled filtration, while the entire filter assembly can be transferred to the semiconductor substrate. This intermediary approach resolves the contradiction by providing the needed precision without requiring direct complex deposition equipment on the substrate.
Solution Approach 2:
The patent replaces conventional mechanical deposition methods with a filtration-based approach. Instead of using complex mechanical deposition equipment to directly deposit aligned nanotubes, the system uses a filtration process where nanotubes are deposited through a filter membrane under controlled flow conditions. This substitution achieves superior alignment and purity through the filtration mechanism rather than mechanical deposition control.
2Productivity
If feature size is reduced to increase integration density, then more components can be integrated, but alignment and purification of carbon nanotubes become more challenging
Solution Approach 1:
The filter membrane acts as an intermediary that enables precise nanotube alignment and purification independent of the final device feature size. By depositing nanotubes through the filter membrane first, then transferring the entire filter assembly to the semiconductor substrate, the system achieves high integration density while maintaining excellent alignment and purity even at reduced feature sizes below 2 nm.
Solution Approach 2:
The deposition process is segmented into distinct stages: (1) nanotube deposition through the filter membrane, (2) optional thinning of the nanotube stack, and (3) transfer to the semiconductor substrate. This segmentation allows each stage to be optimized independently, enabling high integration density while maintaining alignment quality at small feature sizes.
3Quantity of substance
If a stack of multiple nanotube layers is formed, then high-density layers are achieved, but removal of specific layers and surrounding spacers becomes difficult
Solution Approach 1:
The patent enables selective removal of spacers and specific nanotube layers from the stack through the filter membrane structure. The filter membrane provides access to the nanotube stack from one side, allowing spacers to be extracted and specific layers to be removed without disrupting the entire structure. This extraction capability maintains high nanotube layer density while enabling precise manufacturing control.
Solution Approach 2:
The filter membrane structure provides localized access to specific regions of the nanotube stack, enabling selective manipulation of spacers and individual nanotube layers. Different regions of the stack can have different treatments applied - some layers retained, others removed - while maintaining the overall high-density structure where needed.
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 method achieves high-purity, aligned carbon nanotube layers with precise control over spacing and thickness, improving semiconductor device integration density and performance, particularly beyond the 2 nm node, by ensuring efficient alignment and purification of carbon nanotubes.
Implementation Method 1
a vacuum system with a filter and electrostatic field is used to deposit and align carbon nanotubes
Implementation Method 2
the pressure differential can be utilized to help filter the carbon nanotubes from the solution and deposit the carbon nanotubes onto the filter
Implementation Method 3
the filter membrane can have an electrostatic field that can be utilized to align the carbon nanotubes as the carbon nanotubes are being filtered through the filter membrane
Implementation Method 4
the pressure differential can be utilized to help filter the carbon nanotubes from the solution
Implementation Method 5
employing a combination of passive and active electrostatic field generation and surfactant introduction to align and purify the nanotubes
Data Source
AI summary
A semiconductor device and method of manufacturing using carbon nanotubes are provided. In embodiments a stack of nanotubes are formed and then a non-destructive removal process is utilized to reduce the thickness of the stack of nanotubes. A device such as a transistor may then be formed from the reduced stack of nanotubes.