Rational Interface Design Toward Mechanically Durable Flexible Perovskite Solar Cells.

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Flexible perovskite solar cells (f-PSCs) possess desirable properties like lightweight and bendability for expanded photovoltaic applications.
• However, their practical deployment is hindered by fragile interfaces, compromising mechanical stability.

Purpose of the Study:

• To explore the origin of perovskite lattice flexibility.
• To summarize the progress of f-PSCs.
• To review strategies for enhancing the mechanical durability of f-PSCs.

Main Methods:

• Analysis of perovskite lattice flexibility origins.
• Review of historical f-PSC development.
• Introduction to fracture mechanics and characterization of f-PSCs.
• Systematic review of interface engineering strategies.

Main Results:

• Identified strategies for boosting mechanical durability via interface design.
• Discussed regulation of perovskite crystallization for optimum crystallinity and suppressed lattice strain.
• Highlighted construction of grain boundary patches to homogenize mechanical properties.
• Emphasized facilitating energy dissipation and strengthening interfacial contact for improved fracture resistance.

Conclusions:

• Interface engineering is crucial for improving the mechanical durability of f-PSCs.
• Optimizing perovskite crystallization, grain boundaries, and interfacial contact enhances robustness.
• Further development is needed for efficient and mechanically robust f-PSCs.