Role of 2D Perovskites in Enhancing Durability of Perovskite Solar Cells
2D perovskites play a crucial role in enhancing the durability and stability of perovskite solar cells through several mechanisms:
Key Contributions
- Templating and Film Quality: 2D perovskites can serve as templates for the growth of 3D perovskite films, such as formamidinium lead iodide (FAPbI3). This templating process helps to improve the quality of the 3D films by reducing internal disorder and promoting a more stable crystal structure, which enhances both efficiency and durability.
- Passivation: 2D perovskites can act as passivation layers for 3D perovskites. This passivation helps reduce defects and non-radiative recombination at the interfaces between the perovskite and other layers, thereby improving the overall photovoltaic efficiency and stability.
- Compressive Strain: The use of 2D perovskites can impart compressive strain on the 3D perovskite material, which stabilizes the photoactive phase. For instance, Ruddlesden-Popper 2D perovskites can force the formation of the black phase FAPbI3 at lower temperatures, contributing to stability and efficiency.
- Synergistic Effects in 3D-2D Bilayers: Combining 3D and 2D perovskites in bilayer structures leverages the stability of 2D perovskites while maintaining the efficiency of 3D perovskites. These structures exhibit superior durability compared to purely 3D perovskite solar cells.
- Cation Migration Control: In mixed-dimensional perovskite systems, controlling cation migration within the 2D layer is crucial for maintaining stability. This involves designing 2D layers that minimize migration under operating conditions, which affects the long-term performance of the solar cells.
Conclusion
In summary, 2D perovskites enhance the durability of perovskite solar cells by acting as templates and passivation layers, imparting compressive strain, and offering synergistic effects when combined with 3D perovskites in bilayer configurations. These advancements are crucial for overcoming the stability challenges associated with traditional perovskite solar cells.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/what-role-do-2d-perovskites-play-in-enhancing-the-durability-of-perovskite-solar-cells/
