Publication date: 28th August 2024
A recent classification of multilayered perovskites as Ruddlesden-Popper, Dion-Jacobson and "Alternative cations in the interlayer" was introduced in relation with the chemistry of the compounds or the crystallographic order along the stacking axis. 2D multilayered perovskites exhibit indeed attractive features related to tunable quantum and dielectric confinements, strong lattice anisotropy, more complex combinations of atomic orbitals and lattice dynamics than 3D perovskites, extensive chemical engineering possibilities. But more important for photovoltaic applications, 2D multilayered perovskites have exhibited improved device stability under operation [1]. Combined in quasi-lattice matched [2] 2D/3D thick bilayer structures, excellent solar cell device stability can be achieved. Band alignment calculations nicely explain the difference of performances for n-i-p or p-i-n devices [3]. The lattice mismatch concept [2] can also provide guidance for the choice of the proper 2D/3D combination, with the prospect of using 2D perovskite as a template during the growth of a 3D perovskite, leading also to enhanced stability of 3D-based solar cells. This was demonstrated recently the stabilization of MA-free, solar cells based on pure FAPbI3 [4]
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