Temperature-Dependent Carrier Transport in GaN Nanowire Wrap-Gate Transistor

Area of Science:

• Materials Science
• Nanotechnology
• Semiconductor Physics

Background:

• Carrier transport mechanisms in nanowires are critical for next-generation nanoscale devices.
• Gallium Nitride (GaN) nanowires offer unique electronic properties for advanced applications.

Purpose of the Study:

• To investigate the temperature-dependent characteristics of GaN nanowire wrap-gate transistors (WGTs).
• To understand how carrier transport is affected by temperature variations in these nanoscale devices.

Main Methods:

• Fabrication of GaN nanowire WGTs using a top-down approach.
• Experimental analysis of transistor conductance as a function of temperature and gate voltage.

Main Results:

• Conductance remained stable up to 240 K at gate voltages below threshold (Vgs < Vth).
• Sharp conductance fluctuations occurred between threshold and flat-band voltages (Vth < Vgs < VFB) with increasing temperature.
• Conductance decreased with rising temperature for gate biases above the flat-band voltage (Vgs > VFB).

Conclusions:

• Observed temperature effects are likely due to phonon and impurity scattering on the GaN nanowire surface or core.
• These findings provide crucial insights into the operational limits and design considerations for GaN-based nanoscale electronic devices.