Rectifying ZnO-Na/ZnO-Al aerogels p-n homojunctions

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Physics

Background:

• Zinc oxide (ZnO) is a versatile semiconductor with applications in electronics.
• Aerogels offer unique porous structures beneficial for material properties.
• Doping is a key method to tune semiconductor characteristics.

Purpose of the Study:

• To synthesize Al-doped (n-type) and Na-doped (p-type) ZnO aerogels.
• To investigate the structural and electronic properties of these doped ZnO aerogels.
• To fabricate and characterize ZnO-based p-n homojunctions.

Main Methods:

• Sol-gel synthesis of ZnO aerogels with varying Al or Na concentrations.
• Supercritical CO2 drying and calcination at 500°C.
• Drop casting of doped ZnO aerogels onto ITO-coated glass substrates.

Main Results:

• Synthesized porous ZnO aerogels with hexagonal and platelet-shaped particles.
• Al doping significantly reduced the bandgap and increased the surface area of ZnO aerogels.
• Fabricated ZnO-Na/ZnO-Al p-n homojunctions displayed characteristic diode rectifying behavior.

Conclusions:

• Al-doped and Na-doped ZnO aerogels can be successfully synthesized.
• Doping effectively modifies the electronic and structural properties of ZnO aerogels.
• The fabricated ZnO homojunctions demonstrate potential for diode applications.