Surface engineering of perovskite films for efficient solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• High-efficiency perovskite solar cells require smooth and dense perovskite films.
• Solution casting methods often lead to defects like pinholes and incomplete surface coverage.

Purpose of the Study:

• To demonstrate a fast and efficient vacuum deposition method for optimizing solution-based perovskite films.
• To improve the surface morphology, power conversion efficiency (PCE), and stability of perovskite solar cells.

Main Methods:

• A vacuum deposition technique was employed to treat solution-processed perovskite films.
• Planar perovskite solar cell devices were fabricated and characterized.
• The effect of vacuum deposition thickness on electron transport and device performance was investigated.

Main Results:

• The vacuum deposition method resulted in optimized perovskite film morphology.
• Planar devices achieved an average PCE of 13.42% (±2.15%) with a best efficiency of 15.57%.
• Devices exhibited excellent stability, with less than 9% degradation over 30 days under ambient conditions.

Conclusions:

• The vacuum deposition method is a versatile approach for preparing high-quality perovskite films.
• This technique significantly enhances the performance and stability of perovskite photovoltaic devices.
• The study paves the way for developing high-performance and stable perovskite solar cells.