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Silicon Conical Structures by Metal Assisted Chemical Etching.
Oscar Pérez-Díaz1, Enrique Quiroga-González1
1Institute of Physics, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Mexico.
Micromachines
|April 16, 2020
Summary
This study introduces a straightforward and affordable technique for creating silicon (Si) conical structures using photolithography and metal-assisted chemical etching (MACE). This method enables the fabrication of micro- and nano-scale conical structures in a standard laboratory setting.
Area of Science:
- Materials Science
- Nanotechnology
- Microfabrication
Background:
- Silicon microstructures are crucial for various applications, including sensors and microelectronics.
- Existing fabrication methods can be complex and costly.
- There is a need for simple, scalable techniques to produce silicon nanostructures.
Purpose of the Study:
- To develop a simple, inexpensive, and scalable method for fabricating silicon (Si) conical structures.
- To utilize metal-assisted chemical etching (MACE) with small catalyst particles for controlled etching.
- To demonstrate the versatility of the method for producing structures of varying sizes.
Main Methods:
- Photolithography to define the base pattern of the structures.
- Metal-assisted chemical etching (MACE) using catalyst particles smaller than 40 nm to create porous silicon.
- Selective dissolution of porous silicon in a post-etching step to reveal the final conical shape.
- Control over the lateral etching by catalyst particle size.
Main Results:
- Successfully fabricated Si conical structures with dimensions ranging from microns to hundreds of microns.
- Demonstrated that the shape of the lithography mask dictates the base shape of the conical structures.
- Achieved controlled etching through the use of sub-40 nm catalyst particles in MACE.
- The process is adaptable for creating various conical structures.
Conclusions:
- The proposed method offers a simple, cost-effective, and accessible route to fabricate Si conical structures.
- This technique is suitable for basic chemical laboratories, promoting wider accessibility to microfabrication.
- The ability to control structure size and shape makes it promising for diverse nanotechnology applications.
