Phase Purity in Low Dimensional Perovskites

Achieving phase purity in metal halide perovskites is crucial for their optoelectronic properties and enables more efficient and stable devices. While there is a lot of work on understanding and controlling of phase purity of 3D perovskites, there is less work on lower dimensional perovskite structures. In this work, I will discuss the current understanding of phase purity and phase transformations in 2D perovskites. I will also discuss general pathways to control phase purity and stability via surface modification both in the substrate and in the bulk. Our findings provide new insights into the role of surface energies on the growth of phase pure materials.