Layered Hybrid Perovskites with Micropores Created by Alkylammonium Functional Silsesquioxane Interlayers

Layered organic–inorganic
hybrid perovskites that consist
of metal halides and organic interlayers are a class of low-dimensional
materials. Here, we report the fabrication of layered hybrid perovskites
using metal halides and silsesquioxane with a cage-like structure.
We used a silsesquioxane as an interlayer to produce a rigid structure
and improve the functionality of perovskite layers. Propylammonium-functionalized
silsesquioxane and metal halide salts (CuCl2, PdCl2, PbCl2, and MnCl2) were self-assembled
to form rigid layered perovskite structures with high crystallinity.
The rigid silsesquioxane structure produces micropores between the
perovskite layers that can potentially be filled with different molecules
to tune the dielectric constants of the interlayers. The obtained
silsesquioxane–metal halide hybrid perovskites exhibit some
characteristic properties of layered perovskites including magnetic
ordering (CuCl42– and MnCl42–) and excitonic absorption/emission (PbCl42–). Our results indicate that inserting
silsesquioxane interlayers into hybrid perovskites retains and enhances
the low-dimensional properties of the materials.