Dual-Passivation Interfacial Engineering with Creatinol-O-Phosphate for High-Efficiency and Stable Perovskite Solar...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Tin oxide (SnO2) is a key electron transport layer (ETL) in perovskite solar cells (PSCs).
• Surface defects on SnO2 and substrate interactions limit perovskite film quality and photovoltaic efficiency.
• Interface engineering is crucial for advancing PSC performance.

Purpose of the Study:

• To introduce creatinol-O-phosphate (COP) as a bifunctional interlayer for SnO2/perovskite interfaces.
• To investigate COP's dual passivation effects on defects within PSCs.
• To enhance the performance and stability of perovskite solar cells.

Main Methods:

• Incorporation of creatinol-O-phosphate (COP) as an interlayer between SnO2 and perovskite layers.
• Passivation of oxygen vacancies on the SnO2 surface and undercoordinated Pb2+ ions in the perovskite film.
• Analysis of perovskite film quality, grain growth, and crystalline structure.

Main Results:

• COP effectively passivates surface defects, reducing trap-state densities.
• Dual passivation promotes enhanced perovskite grain growth and perpendicular alignment.
• The modified PSCs achieved a power conversion efficiency (PCE) of 24.45%.
• Improved storage stability was observed in the COP-modified devices.

Conclusions:

• Creatinol-O-phosphate (COP) serves as a highly effective interface modifier for PSCs.
• Dual passivation strategy significantly enhances perovskite film quality and device performance.
• COP presents a promising approach for developing high-efficiency and stable perovskite solar cells.