Interface Matters: Boosting Efficient Pb-Sn Perovskite Solar Cells for All-Perovskite Tandem Photovoltaics

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• All-perovskite tandem solar cells (APTSCs) offer a path beyond single-junction perovskite solar cell (PSC) efficiency limits.
• Narrow-bandgap lead-tin (Pb─Sn) PSCs, crucial for APTSCs, face performance limitations due to Sn²⁺ instability and poor interface quality.

Purpose of the Study:

• To review recent advances in interface engineering for efficient Pb─Sn PSCs and APTSCs.
• To analyze challenges and solutions for interfaces in Pb─Sn PSCs, including grain boundaries, buried, and top interfaces.

Main Methods:

• Comprehensive review of literature on interface engineering strategies for Pb─Sn PSCs.
• Examination of underlying mechanisms and performance outcomes of various interface treatments.
• Analysis of the impact of interface engineering on APTSC performance.

Main Results:

• Interface engineering has enabled high-quality Pb─Sn perovskite films, overcoming previous limitations.
• APTSC efficiencies have surpassed 30% due to improved interface quality.
• Specific strategies for grain boundary, buried, and top interfaces have been identified and validated.

Conclusions:

• Rational interface engineering is critical for realizing high-performance Pb─Sn PSCs and APTSCs.
• Continued research into interface stabilization and optimization holds significant promise for advancing solar energy technology.
• This review provides insights for future developments in APTSC research and development.