Mixed-Dimensional MXene-Based Composite Electrodes Enable Mechanically Stable and Efficient Flexible Perovskite...

Area of Science:

• Materials Science
• Optoelectronics
• Flexible Electronics

Background:

• Perovskite light-emitting diodes (PeLEDs) show promise, but flexible device performance is limited by electrode issues.
• Existing flexible electrodes suffer from high surface roughness and suboptimal optoelectronic properties.

Purpose of the Study:

• To engineer efficient and robust flexible PeLEDs by designing an advanced composite electrode.
• To overcome the limitations of current flexible electrodes for improved PeLED performance.

Main Methods:

• Fabrication of a mixed-dimensional (0D-1D-2D-3D) composite electrode using Ag nanoparticles (AgNPs), Ag nanowires (AgNWs), MXene, and PEDOT:PSS.
• Integration of the MXene-based electrode into flexible PeLEDs without a light-coupling structure.

Main Results:

• The composite electrode exhibited high electrical/thermal conductivity, flexibility, a smooth surface, and good transmittance.
• The resulting flexible PeLEDs achieved a record external quantum efficiency of 16.5% and high luminance (~50000 cd/m²).
• A large emitting area (8 cm²) and significantly enhanced mechanical stability were demonstrated.

Conclusions:

• The developed MXene-based composite electrode effectively addresses the challenges in flexible PeLED fabrication.
• This work paves the way for high-performance, durable flexible PeLEDs for various applications.