Surface roughness induced electron mobility degradation in InAs nanowires

Area of Science:

• Materials Science
• Nanotechnology
• Semiconductor Physics

Background:

• Indium Arsenide (InAs) nanowires are promising for electronic applications.
• Electron mobility in nanowires is sensitive to surface properties.
• Chemical vapor deposition (CVD) is a key fabrication method.

Purpose of the Study:

• To investigate the relationship between surface roughness and electron mobility in InAs nanowires.
• To understand the impact of diameter scaling on electron mobility.
• To identify dominant scattering mechanisms affecting electron transport.

Main Methods:

• Fabrication of InAs nanowires using nickel-catalyzed chemical vapor deposition (CVD).
• Electrical characterization of nanowire field-effect transistors (FETs).
• Low-temperature measurements to differentiate scattering effects.

Main Results:

• Electron mobility decreases with increasing surface roughness and nanowire diameter.
• Surface roughness scattering is identified as a dominant factor for miniaturized nanowires.
• Peak field-effect mobility reached 15,000 cm(2) V(-1) s(-1) in optimized devices.

Conclusions:

• Surface roughness is a critical parameter limiting electron mobility in InAs nanowires.
• Device design must consider nanowire surface morphology and dimensions for optimal performance.
• Further research into surface passivation techniques is warranted.