| •The concept of epitaxy formation between iso- or multi-dimensional perovskites still needs to be disclosed properly, which is necessary to design wide varieties of perovskite core/shelling |
• In the case of the 3D/2D system, the van der Waals epitaxy forms between the organic spacer of 2D perovskite with metal halide octahedra; therefore, the design of the organic molecule (spacer cation) with a suitable functional group for better interaction |
| • In the case of the 3D/3D and 3D/0D systems, it is important to understand the lattice constant of both the materials |
| •Two-step preparation method sometimes leads to the further abrupt growth of core materials alongside the growth of shelling materials |
• Improved purification of the core materials is very important, since the unreacted precursors can react further to promote the control/abrupt growth |
| • Reaction parameters such as temperature and reaction time need to be considered for the growth of shelling materials |
| •Uncontrolled growth of the shelling material |
• Dropwise addition of the shelling material as a function of time instead of one-time addition might help to prevent the uncontrolled growth of shelling materials |
| • Shelling must be done at considerably lower temperature to prevent a faster growth |
