All-Solution-Processed Perovskite Light-Emitting Diodes Based on a Thiol-Modified ZnO Electron-Transporting Layer.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• All-solution-processed perovskite light-emitting diodes (LEDs) offer cost-effective, large-scale manufacturing potential.
• Zinc oxide (ZnO) is a key material in optoelectronics but its polar solvents damage perovskite layers.

Purpose of the Study:

• To develop a stable ZnO ink compatible with perovskite films for solution-processed LEDs.
• To overcome photoluminescence quenching issues caused by traditional ZnO inks.

Main Methods:

• Surface ligands of ZnO nanoparticles were modified from acetates to thiols.
• ZnO nanoparticles were dispersed in a nonpolar solvent (n-octane).
• Fabrication of green perovskite LEDs using the modified ZnO ink.

Main Results:

• The nonpolar ZnO ink prevented perovskite film degradation.
• Thiol ligands improved the conduction band energy level, reducing exciton quenching.
• Achieved high performance: 21,000 cd/m² brightness and 6.36% external quantum efficiency.

Conclusions:

• Successfully created a nonpolar ZnO ink for all-solution-processed perovskite LEDs.
• Demonstrated a viable method for fabricating high-performance, solution-processed perovskite optoelectronics.
• The developed ZnO ink is crucial for advancing efficient and scalable perovskite LED technology.