Planar Perovskite Solar Cells Using Perovskite CsPbI₃ Quantum Dots as Efficient Hole Transporting Layers

Area of Science:

• Materials Science
• Renewable Energy

Background:

• Perovskite solar cells (PSCs) are promising for next-generation photovoltaics.
• Hole-transporting layers (HTLs) are crucial for efficient PSC performance.
• Cesium lead iodide (CsPbI3) quantum dots (QDs) offer tunable optoelectronic properties.

Purpose of the Study:

• To synthesize CsPbI3 QDs for use as an HTL in planar PSCs.
• To investigate the effect of ligand engineering on CsPbI3 QD properties and PSC performance.
• To enhance the microstructure and efficiency of perovskite films.

Main Methods:

• Synthesis of CsPbI3 QDs using Octam solution for ligand engineering.
• Incorporation of engineered CsPbI3 QDs as HTL in planar PSCs.
• Characterization of QD morphology, film microstructure, and device performance metrics.

Main Results:

• Octam ligand engineering resulted in denser grains and larger sizes of CsPbI3 QDs.
• CsPbI3 QDs created a smooth, uniform surface on the MAPbI3 perovskite film.
• Optimized PSCs achieved an open-circuit voltage of 1.09 V, current density of 20.5 mA/cm², FF of 75.7%, and PCE of 17.0%.

Conclusions:

• Introducing CsPbI3 QDs as an HTL via ligand engineering significantly improves PSC device performance.
• Ligand engineering is an effective strategy for enhancing the properties of QDs for solar cell applications.
• The study demonstrates a viable pathway for developing more efficient perovskite solar cells.