ITO/Ag/ITO multilayer-based transparent conductive electrodes for ultraviolet light-emitting diodes

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Transparent conductive electrodes (TCEs) are crucial for optoelectronic devices.
• Indium tin oxide (ITO)/silver (Ag)/ITO (IAI) multilayers offer potential for TCE applications.
• Optimizing IAI multilayer properties is key to improving device performance.

Purpose of the Study:

• To fabricate and optimize IAI multilayer-based TCEs for ultraviolet light-emitting diodes (UV-LEDs).
• To investigate the effect of annealing temperature on the electrical and optical properties of IAI multilayers.
• To determine the optimal annealing conditions for achieving low sheet resistance and high transmittance.

Main Methods:

• Fabrication of IAI multilayer structures using reactive sputtering.
• Optimization of IAI multilayers through post-deposition annealing at varying temperatures (300°C-500°C).
• Characterization of electrical properties (sheet resistance) and optical properties (transmittance).

Main Results:

• Increasing annealing temperature from 300°C to 500°C led to decreased sheet resistance and increased optical transmittance.
• The lowest sheet resistance of 9.21 Ω/sq and highest transmittance of 88% at 380 nm were achieved at 500°C annealing in N₂ gas.
• Improved crystallinity of the IAI multilayer and reduced Ag near-UV absorption coefficient were observed with increasing annealing temperature.

Conclusions:

• Annealing is an effective method for optimizing the performance of IAI multilayer TCEs.
• Optimal annealing at 500°C in N₂ gas yields excellent electrical and optical properties for UV-LED applications.
• IAI multilayers show promise as a cost-effective and high-performance alternative for TCEs in UV optoelectronics.