In Situ Dual-Interface Passivation Strategy Enables The Efficiency of Formamidinium Perovskite Solar Cells Over 25.

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) show high power conversion efficiencies (PCEs).
• Improving PSCs often involves complex post-treatment defect passivation, hindering commercialization.
• Interfacial defects are a key limitation for PSC performance and stability.

Purpose of the Study:

• To develop a concise and efficient in situ dual-interface passivation strategy for PSCs.
• To mitigate interfacial defects and reduce nonradiative recombination losses.
• To enhance charge extraction and improve the overall stability of PSCs.

Main Methods:

• Utilized 1-butyl-3-methylimidazolium methanesulfonate (MS) as a precursor additive during perovskite crystallization.
• Investigated the self-assembly of MS species through precipitation with SnO2 and lattice extrusion.
• Employed in situ dual-interface passivation to address defects.

Main Results:

• Achieved a power conversion efficiency (PCE) exceeding 25% (certified 24.84%).
• Demonstrated substantially improved long-term storage and photothermal stabilities.
• Reduced nonradiative recombination losses through effective defect passivation.

Conclusions:

• The in situ dual-interface passivation strategy using MS is highly effective.
• This approach offers a promising route for the industrialization of PSCs.
• The findings provide valuable insights into interfacial engineering for photovoltaic devices.