Constructing High-Performance Inverted Perovskite Solar Cells Using Chiral Organic Molecules.

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Chiral molecules are explored for passivating perovskite solar-cell interfaces.
• Understanding chiral structure effects on perovskite films and photoelectric properties is crucial.

Purpose of the Study:

• Investigate passivation mechanisms of different chiral methylbenzylammonium chloride (MBACl) structures.
• Evaluate the impact of MBACl on perovskite solar cell performance and stability.

Main Methods:

• Utilized R-, S-, and racemic-MBACl for interface defect passivation.
• Employed Kelvin probe force microscopy to analyze surface potential changes.
• Fabricated and tested perovskite solar cell devices with MBACl modification.

Main Results:

• S-MBACl demonstrated superior chelation and passivation effects.
• S-MBACl increased surface potential differences by 227%, enhancing electron-hole separation.
• S-MBACl modified devices achieved a power conversion efficiency (PCE) of 24.07%, a 109% improvement over pure perovskite cells.
• Unencapsulated S-MBACl devices maintained 89% of their initial PCE after 2400 hours of aging.

Conclusions:

• Chiral MBACl molecules effectively passivate perovskite interfaces.
• S-MBACl shows significant potential for enhancing perovskite solar cell efficiency and long-term stability.
• This research offers valuable insights for developing advanced chiral passivation strategies.