Low-temperature solution-processed LaNiO₃ hole-transport layer for UV-stable inverted perovskite solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Solid-State Chemistry

Background:

• Perovskite solar cells (PSCs) are promising for next-generation photovoltaics.
• Efficient and stable hole-transport layers (HTLs) are crucial for PSC performance.
• Current HTLs often require high-temperature processing, limiting fabrication options.

Purpose of the Study:

• To develop a novel, low-temperature solution-processed inorganic HTL for inverted PSCs.
• To investigate the potential of lanthanum nickelate (LaNiO3) as an HTL material.
• To assess the efficiency and photostability of PSCs utilizing the new LNO HTL.

Main Methods:

• Solution-processing of inorganic lanthanum nickelate (LaNiO3) films at temperatures below 150 °C.
• Fabrication of inverted perovskite solar cells (PSCs) using the LNO HTL.
• Characterization of PSC device performance, including power conversion efficiency and UV-stability.

Main Results:

• Successfully prepared an inorganic LaNiO3 HTL via low-temperature solution processing.
• Inverted PSCs with the LNO HTL achieved a promising power conversion efficiency of 17.15%.
• The fabricated PSCs demonstrated high UV-stability, indicating improved photostability.

Conclusions:

• The developed low-temperature LaNiO3 HTL is a viable alternative for efficient PSC fabrication.
• This method offers potential for cost-effective and scalable production of stable inverted PSCs.
• LaNiO3 presents significant promise as a hole-transport material for high-performance perovskite solar cells.