Enhancing Chemical Bonding at Buried Interface Enables Improved Performance of Perovskite Solar Cell

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• The buried interface is critical for perovskite device performance and longevity.
• Conventional self-assembled monolayers (SAMs) often exhibit poor contact due to weak intermolecular forces.

Purpose of the Study:

• To develop an improved interfacial engineering strategy for perovskite solar cells.
• To enhance charge transport, reduce defects, and improve crystal growth at the buried interface.

Main Methods:

• A novel co-assembly monolayer method was employed.
• Acetyl dl-carnitine chloride (ACL) was incorporated into a [4-(3,6-dimethyl-9H-carbazol-9yl) butyl] phosphonic acid (Me-4PACz) solution.
• The modified SAM was applied to the buried interface of perovskite solar cells.

Main Results:

• The ACL incorporation significantly improved SAM coverage and chemical bonding at the buried interface.
• Perovskite solar cells achieved a power conversion efficiency of 25.78% under simulated AM1.5 sunlight.
• Devices maintained over 90% of their initial efficiency after approximately 600 hours of operation.

Conclusions:

• The co-assembly monolayer method effectively enhances the buried interface in perovskite solar cells.
• This approach leads to superior device performance and long-term operational stability.
• The strategy offers a promising pathway for developing highly efficient and durable perovskite photovoltaic technologies.