Fabricating and Controlling Silicon Zigzag Nanowires by Diffusion-Controlled Metal-Assisted Chemical Etching Method

Area of Science:

• Materials Science
• Nanotechnology
• Surface Chemistry

Background:

• Silicon nanowires (NWs) offer high surface-to-volume ratios, making them promising for various applications.
• Fabrication of silicon zigzag nanowires (NWs) has been a significant challenge in nanotechnology.

Purpose of the Study:

• To develop an efficient and economical method for fabricating silicon zigzag nanowires (NWs).
• To investigate the factors influencing the formation and morphology of silicon zigzag NWs.
• To demonstrate potential applications of fabricated silicon zigzag NWs.

Main Methods:

• A diffusion-controlled metal-assisted chemical etching method was employed.
• Etchant composition was tailored to control diffusivity and etching direction.
• Etching time and substrate location were varied to influence NW morphology.

Main Results:

• Successfully fabricated silicon zigzag nanowires (NWs) using the developed method.
• A critical nanowire length exceeding 1 μm was identified as necessary for zigzag formation.
• Zigzag amplitude increased with proximity to the substrate's center and with nanowire length.

Conclusions:

• The diffusion-controlled metal-assisted chemical etching method provides a feasible and economical route to silicon zigzag NWs.
• Tailoring etchant properties and etching parameters allows for controlled fabrication of various zigzag NW morphologies.
• Silicon zigzag NWs demonstrate potential for self-cleaning and antireflection applications, opening avenues for novel structures.