Buried Interface Passivation Using Organic Ammonium Salts for Efficient Inverted CsMAFA Perovskite Solar Cell...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PeSCs) show promise for efficient energy conversion.
• Defect density and phase instability limit PeSC performance.
• Interface passivation is crucial for charge carrier dynamics.

Purpose of the Study:

• To improve the quality and stability of perovskite films using dual additives.
• To enhance the photoelectric conversion efficiency (PCE) of PeSCs through interface passivation.

Main Methods:

• Utilized CsCl and MACl as dual additives to optimize perovskite composition (Cs_0.1MA_0.09FA_0.81PbCl_0.14I_2.86).
• Employed butane-1,4-diammonium iodide (BDAI₂) for perovskite bottom surface (buried interface) passivation.
• Characterized device performance, including open-circuit voltage (Voc), short-circuit current density (Jsc), fill factor (FF), and PCE.

Main Results:

• CsCl reduced trap density and recombination, while MACl enhanced phase stability.
• BDAI₂ passivation suppressed interface defects and improved crystallinity.
• PeSCs with BDAI₂ passivation showed increased Jsc (24.5 mA cm^-2), FF (79.9%), and PCE (20.5%) compared to unpassivated devices (Jsc: 24.0 mA cm^-2, FF: 74.1%, PCE: 18.6%).

Conclusions:

• Dual additive strategies with CsCl and MACl effectively improve perovskite quality and stability.
• Interface passivation using BDAI₂ is a viable method to reduce carrier recombination and enhance PeSC performance.
• The optimized PeSC demonstrates significantly improved efficiency, paving the way for advanced photovoltaic applications.