Phase control of quasi-2D perovskite thin films by adding MAPbI₃ in the precursor solution

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Quasi-two-dimensional (Q-2D) perovskite solar cells offer improved stability over 3D counterparts.
• Q-2D perovskite films are typically phase mixtures (small- and large-n), impacting device performance.
• Controlling phase composition and distribution is crucial for optimizing Q-2D perovskite solar cells.

Purpose of the Study:

• To enhance the performance of quasi-2D perovskite solar cells.
• To investigate the effect of incorporating 3D perovskite powder into Q-2D precursor solutions.
• To create uniform heterostructures for improved charge transport in Q-2D perovskite films.

Main Methods:

• Incorporation of commercialized 3D perovskite powder into an ACI perovskite precursor solution.
• Fabrication of Q-2D perovskite thin films with a uniform, closely connected heterostructure.
• Characterization of film morphology and device performance through photovoltaic measurements.

Main Results:

• The addition of 3D perovskite powder resulted in a homogeneous distribution of large-n phases within the Q-2D film.
• These large-n phases acted as effective pathways for charge transfer.
• The power conversion efficiency of the Q-2D ACI perovskite solar cells increased from 10.4% to 13.82%.

Conclusions:

• Homogeneous incorporation of 3D perovskite phases into Q-2D perovskite films significantly enhances photovoltaic performance.
• The developed method provides a simple yet effective strategy for improving Q-2D perovskite solar cell efficiency and stability.
• This approach offers a promising pathway for advancing perovskite solar cell technology.