Multifunctional Ionic Liquid as an Interfacial Modifier for High-Performance and Stable NiO-Based Inverted Perovskite...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Interface instability is a major limitation in improving the durability of perovskite solar cells (PSCs).
• Modifying interfaces with specific molecules is a key strategy to enhance device performance and stability.

Purpose of the Study:

• To investigate the use of an ionic liquid, 1-ethyl-3-methylimidazolium aminoacetate (EMIMAE), for modifying the NiO/perovskite interface in PSCs.
• To improve the efficiency and long-term stability of PSCs through interface engineering.

Main Methods:

• Fabrication of PSCs with a NiO/perovskite interface modified by an EMIMAE layer.
• Characterization of the modified interface's effect on perovskite growth, defect passivation, and charge transport.
• Performance and long-term stability testing under continuous maximum power point tracking.

Main Results:

• The EMIMAE layer effectively regulated perovskite growth, passivated defects, and promoted charge transport.
• The optimized PSCs achieved a power conversion efficiency of 18.6%.
• The modified devices retained 95% of their initial efficiency after 1000 hours of continuous operation.

Conclusions:

• Interface modification using EMIMAE is a simple yet effective strategy to enhance PSC performance and durability.
• This approach offers a promising pathway for the commercialization of NiO-based perovskite solar cells.