Reduction of Nonradiative Recombination at Perovskite/C₆₀ Interface in Inverted Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) show high efficiency but suffer from nonradiative recombination.
• The perovskite/C60 interface is a critical area for efficiency losses in p-i-n PSCs.

Purpose of the Study:

• To develop a synergistic passivation strategy for the perovskite/C60 interface in p-i-n PSCs.
• To reduce nonradiative recombination losses and enhance the performance and stability of PSCs.

Main Methods:

• A synergistic passivation strategy using meta-fluoro-phenylethylammonium iodide and piperazine iodide was employed.
• In situ perovskite film reconstruction and interface defect passivation were achieved.
• Interface energy levels and electric fields were optimized.

Main Results:

• The strategy led to a smooth perovskite surface and reduced interface defects.
• Optimized PSCs achieved a power conversion efficiency of 25.85% (certified 25.22%).
• The devices maintained 95% of their initial efficiency after 1000 hours of operation.

Conclusions:

• The synergistic passivation strategy effectively suppresses nonradiative recombination at the perovskite/C60 interface.
• This approach significantly enhances the efficiency and long-term stability of p-i-n PSCs.
• The developed process is universally applicable and scalable for industrial production.