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High-aspect-ratio structure fabrication on (110)-oriented silicon surfaces using tribo-nanolithography.
Noritaka Kawasegi1, Noboru Morita
1Planning and Management Department, Toyama Industrial Technology Center 150 Futagami, Takaoka, Toyama 933-0981, Japan.
Journal of Nanoscience and Nanotechnology
|April 2, 2010
Summary
This study demonstrates a simple method for creating high-aspect-ratio silicon structures using tribo-nanolithography and etching. This technique enables precise fabrication of sub-micrometer structures with vertical sidewalls.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Engineering
Background:
- Fabricating high-aspect-ratio structures is crucial for microelectronics and MEMS.
- Existing methods often involve complex or costly processes.
Purpose of the Study:
- To investigate a novel method for fabricating high-aspect-ratio silicon structures.
- To optimize tribo-nanolithography and wet chemical etching parameters for structure control.
Main Methods:
- Utilized tribo-nanolithography to create an amorphous silicon phase with enhanced etch resistance.
- Employed wet chemical etching with potassium hydroxide on (110)-oriented silicon.
- Investigated the influence of machining parameters (normal load, repetitions, direction) on structure formation.
Main Results:
- Achieved vertical sidewalls by machining along the (112) direction.
- Demonstrated that etch resistance, width, and height are controllable via normal load and repetitions.
- Confirmed aspect ratio increases with etch time while the amorphous phase persists.
Conclusions:
- A simple and effective method for fabricating sub-micrometer high-aspect-ratio silicon structures was established.
- The developed technique shows promise for scalable microfabrication applications.
- Control over machining parameters allows for tailored structure dimensions and aspect ratios.
