Electroluminescent devices based on amorphous SiN/Si quantum dots/amorphous SiN sandwiched structures.

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Physics

Background:

• Silicon quantum dots (Si QDs) are promising for optoelectronic applications.
• Efficient light emission from silicon-based materials remains a challenge.

Purpose of the Study:

• To fabricate and characterize electroluminescent diodes using Si QDs.
• To investigate the relationship between device performance and material properties.

Main Methods:

• Fabrication of Si QDs within amorphous silicon nitride (SiN) layers via laser crystallization and annealing.
• Fabrication of electroluminescent diodes with aluminum electrodes on p-Si substrates.
• Electrical and optical characterization at room temperature.

Main Results:

• Room-temperature electroluminescence observed with applied negative voltage (~10V).
• Luminescent intensity increases with applied voltage.
• Integrated luminescent intensity shows a linear relationship with injection current.
• Carrier concentration dependence on Fowler-Nordheim tunneling through SiN barriers is suggested.

Conclusions:

• Dense Si QDs embedded in SiN layers enable efficient room-temperature electroluminescence.
• Device performance is influenced by carrier injection mechanisms and SiN band gap.