Tetraphosphorylated phthalocyanine-based self-assembled monolayer stabilizes perovskite photovoltaics

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Self-assembled monolayers (SAMs) are crucial for improving perovskite solar cell (PSC) power conversion efficiency (PCE).
• Operational stability of PSCs under real-world conditions remains a significant challenge, hindering widespread adoption.
• Existing SAMs often lack the necessary photostability and thermal robustness for long-term performance.

Purpose of the Study:

• To develop a novel SAM that enhances both the efficiency and operational stability of PSCs.
• To investigate the impact of a structurally robust and chemically stable SAM on PSC performance.
• To address the limitations of current SAMs in terms of photostability and thermal endurance.

Main Methods:

• Synthesized a phthalocyanine-based SAM with a robust framework and stable chemical bonds.
• Utilized tetraphosphorylation to firmly anchor the phthalocyanine at the interface.
• Fabricated perovskite solar modules incorporating the novel SAM.
• Conducted certified efficiency measurements and outdoor stability testing under the ISOS-O-1 protocol.

Main Results:

• Achieved a certified power conversion efficiency (PCE) of 23.1% (stabilized 22.9%) for a perovskite solar module.
• Demonstrated enhanced photostability and thermal stability due to the robust SAM structure.
• Observed improved charge extraction and assembly uniformity at the interface.
• Exhibited no performance degradation over 61 days of outdoor aging, confirming reliable durability.

Conclusions:

• The developed phthalocyanine-based SAM significantly improves the operational stability and PCE of PSCs.
• Tetraphosphorylation is an effective strategy for enhancing interfacial properties and device longevity.
• This approach offers a promising pathway towards durable and efficient perovskite solar modules for real-world applications.