Complementary Dual-Ligands Resurfacing CsPbI₃ Perovskite Quantum Dots for High-Performance Solar Cells

Area of Science:

• Materials Science
• Nanotechnology
• Photovoltaics

Background:

• Cesium lead iodide perovskite quantum dots (PQDs) show promise for photovoltaics due to high photoluminescence and solution processability.
• Surface defects from long-chain ligands hinder PQD optoelectronic properties and stability, limiting solar cell performance.

Purpose of the Study:

• To develop a complementary dual-ligand strategy for reconstructing the PQD surface.
• To enhance the optoelectronic properties, stability, and photovoltaic performance of PQDs.

Main Methods:

• A complementary dual-ligand system using trimethyloxonium tetrafluoroborate and phenylethyl ammonium iodide was formed on PQDs via hydrogen bonds.
• Characterization of PQD surface, electronic coupling, and stability.

Main Results:

• The dual-ligand system stabilized PQDs, improving dispersion and inter-dot electronic coupling.
• Enhanced optoelectronic properties, environmental stability, and uniform stacking orientation were observed in PQD solids.
• A record power conversion efficiency of 17.61% was achieved in inorganic PQD solar cells.

Conclusions:

• The complementary dual-ligand strategy effectively engineers PQD surfaces for improved performance.
• This approach offers a new pathway for developing high-performance optoelectronic devices based on PQDs.
• The study demonstrates significant advancements in inorganic PQD solar cell technology.