Wet etch methods for InAs nanowire patterning and self-aligned electrical contacts.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Semiconductor nanowires (NWs) are crucial for sensing, photovoltaics, and quantum devices.
• Indium arsenide (InAs) NWs are promising for hosting topological Majorana states.
• Post-growth tailoring of NWs remains a challenge.

Purpose of the Study:

• To present novel wet chemical etch methods for morphological engineering of InAs NWs.
• To enable precise control over NW dimensions on the sub-100 nm scale.
• To demonstrate the suitability of etched InAs NWs for quantum electronic devices.

Main Methods:

• Three distinct wet chemical etching techniques applied to InAs NWs.
• Formation of self-aligned electrical contacts in the first two methods.
• Creation of conical NW profiles in the third method for potential gradients.

Main Results:

• Etched InAs NWs exhibit stable low-temperature transport characteristics.
• Demonstrated formation of a single, electrically stable quantum dot between etched segments.
• Successful morphological engineering of InAs NWs on the sub-100 nm scale.

Conclusions:

• Wet chemical etching offers effective post-growth engineering of InAs NWs.
• Etched InAs NWs are viable building blocks for quantum electronic devices.
• The developed methods facilitate the creation of tailored nanostructures for quantum applications.