Electrostatically Enhanced Self-Assembled Monolayers Anchoring for Scalable and Stable Inverted Perovskite Solar...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Self-assembled monolayers (SAMs) improve perovskite solar cell (PSC) efficiency.
• Weak adhesion between SAMs, transparent conductive oxide (TCO) substrates, and perovskite layers limits PSC scalability and thermal stability.

Purpose of the Study:

• To develop an electrostatically enhanced anchoring strategy (EEAS) to improve interfacial adhesion and stability in inverted PSCs.
• To investigate the impact of EEAS on perovskite film quality, charge extraction, and overall device performance.

Main Methods:

• Utilized sulfadiazine (SDZ) molecules to deprotonate phosphonic acid groups in SAMs, forming phosphate anions.
• Leveraged electrostatic interactions between phosphate anions and positively charged TCO substrates.
• Exploited protonated SDZ species for coordination interactions with the perovskite layer.

Main Results:

• Achieved a certified power conversion efficiency (PCE) of 26.23% for small-area PSCs (1 cm²).
• Demonstrated scalable fabrication of large-area modules (20.7 cm²) with a PCE of 24.72%.
• Exhibited excellent operational stability, retaining over 94% efficiency after 1000 hours of illumination at 65 °C (ISOS-L-2).

Conclusions:

• The EEAS effectively creates uniform and robust buried interfaces in PSCs.
• This strategy enhances perovskite crystallinity and facilitates efficient charge extraction.
• The EEAS offers a scalable and stable solution for high-performance perovskite solar cells.