Wettability Sequence Optimization and Interface Strain Buffering in Triple Mesoporous Layer-Based Printable...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells (PSCs) show great potential for efficient solar energy conversion.
• Interface engineering is crucial for optimizing PSC performance, particularly the buried interface.
• The buried interface affects perovskite crystallization, strain, and defect formation.

Purpose of the Study:

• To reconstruct the buried interface in printable mesoscopic perovskite solar cells (p-MPSCs) using dodecaethylene glycol (DEG).
• To enhance device performance and stability by optimizing perovskite crystallization and reducing interfacial strain and defects.

Main Methods:

• Utilized a triple-mesoporous scaffold (TiO2/ZrO2/carbon) in p-MPSCs.
• Treated the scaffold with dodecaethylene glycol (DEG), a long-chain molecule with polar oxygen atoms.
• Analyzed the effects of DEG on surface wettability, perovskite crystallization, strain buffering, and defect suppression.

Main Results:

• DEG treatment optimized the wettability sequence, promoting preferential perovskite crystallization on the TiO2 layer.
• The DEG layer effectively buffered residual strain and reduced interfacial defects.
• Optimized p-MPSCs achieved a power conversion efficiency (PCE) of 20.27%.

Conclusions:

• Interface reconstruction with DEG significantly enhances the performance of p-MPSCs.
• The optimized interface leads to improved perovskite crystallization and reduced strain, boosting PCE.
• p-MPSCs demonstrated excellent operational stability, retaining over 92% PCE after 500 hours.