Interlocked Interface Enhances Mechanical Integrity for Thermal-Cycling-Stable Perovskite Solar Cells With 26.82%...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells (PSCs) suffer from mechanical damage and degradation under thermal cycling.
• Simultaneously suppressing interface delamination and chemical degradation to ensure mechanical integrity remains a challenge for PSCs.

Purpose of the Study:

• To develop a universal interlocking strategy to enhance the mechanical integrity and thermal cycling stability of perovskite films.
• To improve the long-term operational stability and efficiency of PSCs.

Main Methods:

• Modification of perovskite films with polymethyl(hydro)/polymethylvinylsilazane (PHVS) to create an interlocked interface.
• Utilizing condensation reactions, hydrogen bonding, and self-crosslinking for interfacial modification.
• Testing the mechanical adhesion, stress release, and degradation suppression under thermal cycling.

Main Results:

• The interlocked interface significantly enhanced adhesion toughness and released residual stress in the perovskite film.
• PHVS-modified PSCs achieved a certified efficiency of 26.82%.
• Encapsulated PSCs retained 96% efficiency after 200 thermal cycles; modules maintained 95% after 1000 hours of outdoor testing.

Conclusions:

• The PHVS interlocking strategy effectively suppresses interface delamination and delays chemical degradation under thermal cycling.
• Enhancing the mechanical integrity of perovskite films is crucial for achieving stable and high-efficiency PSCs.
• This approach offers a promising pathway for developing robust and long-lasting perovskite solar cells.