Hybrid sequential processing of mixed Sn-Pb narrow-bandgap perovskite solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Hybrid vapor-solution sequential deposition is a key technique for large-area perovskite film and solar cell fabrication.
• Narrow-bandgap perovskites are crucial for efficient solar energy conversion.

Purpose of the Study:

• To apply hybrid vapor-solution sequential deposition for the first time to fabricate narrow-bandgap mixed tin-lead perovskite films.
• To develop efficient and stable hole-transport-material-free perovskite solar cells.

Main Methods:

• Fabrication of narrow-bandgap mixed Sn-Pb perovskite films using hybrid vapor-solution sequential deposition.
• Characterization of film morphology, grain size, and photovoltaic performance.
• Fabrication and testing of hole-transport-material-free devices.

Main Results:

• Obtained compact, large-grained perovskite films.
• Achieved power conversion efficiency exceeding 10% under 1 sun illumination.
• Demonstrated elimination of oxidative degradation risks associated with solvents.
• Provided a facile route for additive and passivation strategies.

Conclusions:

• Hybrid vapor-solution sequential deposition is effective for fabricating high-performance narrow-bandgap mixed Sn-Pb perovskite films.
• The method enhances film stability by avoiding solvent-induced degradation.
• This approach facilitates the development of improved perovskite solar cell technologies.