Synergistic Stabilization and Defect Passivation of CsPbI₃ Perovskite Solar Cells Enabled by an In Situ Polymerized...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Cesium lead iodide (CsPbI3) perovskite is a promising photovoltaic material due to its stability and bandgap.
• Challenges include phase transitions and processing defects, hindering performance.
• Developing stable and efficient CsPbI3 perovskite solar cells is crucial for renewable energy.

Purpose of the Study:

• To overcome limitations in CsPbI3 perovskite solar cells using an innovative in situ polymerization strategy.
• To enhance photovoltaic performance, stability, and environmental friendliness of CsPbI3 perovskite solar cells.

Main Methods:

• Incorporation of a multifunctional polymer via in situ polymerization of 2,2,3,4,4,4-hexafluorobutyl acrylate monomers.
• Surface modification of CsPbI3 perovskite films during thermal annealing to form a protective polymer network.
• Passivation of defects, suppression of ion migration, and enhancement of moisture resistance using the polymer modifier.

Main Results:

• The polymer modifier passivates Pb2+ defects and suppresses I- ion migration.
• Enhanced stability of the photoactive black phase of CsPbI3 perovskite was observed.
• Improved film quality, charge transport, and extraction led to a 15.23% power conversion efficiency.
• Substantially improved storage stability and mitigation of lead leakage were achieved.

Conclusions:

• The in situ polymerization strategy effectively enhances the performance and stability of CsPbI3 perovskite solar cells.
• This method offers a promising route towards environmentally friendly and highly efficient perovskite solar cells.
• The multifunctional polymer plays a key role in defect passivation, ion migration suppression, and moisture resistance.