Two-dimensional (n = 1) ferroelectric film solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Solid-State Physics

Background:

• Molecular ferroelectrics offer potential for photovoltaics due to properties like low processing temperature and narrow bandgap.
• Two-dimensional (2D) perovskite solar cells exhibit desirable tunability, photo-physical properties, and stability.
• A key limitation in 2D perovskite solar cells is poor out-of-plane conductivity stemming from their multi-quantum-well structure.

Purpose of the Study:

• To address the poor out-of-plane charge transport in 2D (n=1) Ruddlesden-Popper perovskite solar cells.
• To enhance the efficiency of 2D ferroelectric solar cells by utilizing molecular ferroelectric films as the absorbing layer.
• To overcome the intrinsic limitations of multi-quantum-well electronic structures in 2D perovskites.

Main Methods:

• Utilized 2D molecular ferroelectric film as the active absorbing layer in solar cell fabrication.
• Investigated the impact of molecular ferroelectrics with strong saturation polarization, high Curie temperature, and multiaxial characteristics on charge transport.
• Fabricated and characterized 2D ferroelectric solar cells based on the 2D (n=1) Ruddlesden-Popper perovskite structure.

Main Results:

• Achieved the highest open-circuit voltage (1.29 V) for 2D (n=1) Ruddlesden-Popper perovskite solar cells.
• Attained the highest power conversion efficiency (3.71%) among 2D (n=1) Ruddlesden-Popper perovskite solar cells.
• Demonstrated enhanced out-of-plane charge transport attributed to the employed molecular ferroelectrics.

Conclusions:

• The integration of 2D molecular ferroelectric films effectively breaks the conductivity limitations imposed by multi-quantum-well structures.
• The developed 2D ferroelectric solar cells represent a significant advancement in efficiency and performance for this class of materials.
• This approach offers a promising pathway for improving the efficiency of 2D ferroelectric solar cells.