Dual Defense against Interface Defects and Environmental Stress via Synergistic Encapsulation for Efficient and...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) show great potential for next-generation photovoltaics due to their high performance.
• Long-term stability remains a challenge for PSCs, primarily due to interface defects and environmental stressors like heat and moisture.

Purpose of the Study:

• To develop a synergistic internal and external encapsulation strategy to enhance the operational stability and power conversion efficiency (PCE) of perovskite solar cells.
• To investigate the protective effects of 3,4,5-trifluoroaniline hydroiodide (TFH) and low-temperature laminate sealing on PSCs.

Main Methods:

• Internal encapsulation via deposition of large-sized 3,4,5-trifluoroaniline hydroiodide (TFH) onto 3D perovskite films to passivate defects and improve thermal resistance.
• External encapsulation using low-temperature laminate sealing to create a physical barrier against moisture and oxygen without damaging the internal TFH layer.

Main Results:

• The power conversion efficiency (PCE) of TFH-modified PSCs increased from 24.32% to 26.03%.
• Encapsulated PSCs retained 92.2% of their initial PCE after 400 thermal cycles (2400 hours), demonstrating significant long-term stability.
• The synergistic approach effectively prevented degradation from thermal stress and environmental factors.

Conclusions:

• A novel synergistic encapsulation strategy combining internal TFH treatment and external laminate sealing effectively enhances PSC stability.
• This method significantly improves thermal resistance and protects against moisture and oxygen, leading to higher PCE and prolonged operational lifetime.
• The developed technique offers a promising pathway for commercializing stable, high-efficiency perovskite solar cells.