Amidino-based Dion-Jacobson 2D perovskite for efficient and stable 2D/3D heterostructure perovskite solar cells

    Abstract

    Planar perovskite solar cells have shown great promise as a photovoltaic technology. The formation of a 2D/3D bulk heterostructure has positive effects on solar cell stability; however, it can increase the charge transport barrier and lead to lattice mismatch between the conventional amino-based ligands and the FAPbI3 3D framework. Herein, we demonstrate a 2D/3D composite based on an amidino-based Dion-Jacobson 2D perovskite and reveal how the addition of 2D perovskites influences the crystallization pathways of 3D perovskites by using in situ optical diagnostics. We found that 2D perovskites can provide a skeleton for the growth of 3D films, thus avoiding volume collapse and reducing bulk defects. Finally, the rigid and flexible devices realized a PCE of 24.9% (certified 24.1%) and a PCE of 22.3%, respectively. The results not only provide a promising route toward efficient and stable perovskite solar cells but also highlight a fundamental understanding of the formation mechanism of FAPbI3-based 2D/3D composites.

https://www.sciencedirect.com/science/article/pii/S2542435123000727