Strain Balanced AlGaN/GaN/AlGaN nanomembrane HEMTs.

Area of Science:

• Materials Science
• Semiconductor Physics
• Nanotechnology

Background:

• Single crystal semiconductor nanomembranes (NM) are crucial for heterogeneous integration and flexible electronics.
• Aluminum Gallium Nitride/Gallium Nitride (AlGaN/GaN) heterostructures are key for high-performance electronic devices.

Purpose of the Study:

• To fabricate high-quality AlGaN/GaN nanomembranes (NM).
• To develop AlGaN/GaN NM-based high electron mobility transistors (HEMT).

Main Methods:

• Electrochemical etching was used to slice single-crystalline AlGaN/GaN layers, preserving microstructural quality.
• A double heterostructure design minimized residual strain in freestanding NMs.
• Fabrication of HEMTs on SiO2 and flexible polymeric substrates.

Main Results:

• The AlGaN/GaN NMs exhibited superior two-dimensional electron gas (2DEG) mobility compared to other NMs.
• Fabricated AlGaN/GaN NM HEMTs showed excellent electrical characteristics, including high ON/OFF ratio and transconductance.

Conclusions:

• III-Nitrides nanomembranes are suitable for high-performance electronic applications.
• The developed fabrication technique enables high-quality AlGaN/GaN NMs for flexible and integrated devices.