Interpenetrating interfaces for efficient perovskite solar cells with high operational stability and mechanical...

Area of Science:

• Photovoltaics
• Materials Science
• Solid-State Chemistry

Background:

• Perovskite solar cells offer low cost, high efficiency, and flexibility.
• Concerns exist regarding perovskite solar cell operational stability and mechanical robustness.
• Previous strategies focused on separate layer engineering, limiting holistic improvements.

Purpose of the Study:

• To develop a holistic design for perovskite and charge-transporting layers.
• To synthesize an interpenetrating perovskite/electron-transporting-layer interface.
• To enhance the operational stability and mechanical robustness of perovskite solar cells.

Main Methods:

• Synthesizing an interpenetrating interface between tin dioxide and perovskite layers.
• Utilizing excess organic halide in tin dioxide and excess lead halide in perovskite.
• Conducting advanced microscopic characterizations to understand interface structure-performance relationships.

Main Results:

• Achieved power conversion efficiencies of 22.2% (rigid) and 20.1% (flexible).
• Demonstrated long-term operational stability over 1000 hours.
• Showcased high mechanical endurance for flexible devices (2500 bending cycles).

Conclusions:

• Interface integrity is crucial for efficient, stable, and robust perovskite solar cells.
• The interpenetrating interface design significantly improves device performance and durability.
• This approach offers a promising pathway for advanced photovoltaic applications.