Core Viewpoint - The article discusses a significant breakthrough in the construction of lateral heterostructures in two-dimensional perovskite materials, highlighting the successful controlled patterning of mosaic lateral heterojunctions in thin-layer two-dimensional perovskite single crystals [4]. Group 1 - The research addresses the limitations of existing polycrystalline thin-film structures, which suffer from defects and poor ionic migration behavior, thereby hindering carrier transport efficiency and device performance [3]. - The study presents a method to create size-controllable square holes in two-dimensional perovskite, enabling the construction of large-area continuous lateral heterostructures [6]. - The team successfully synthesized a mosaic lateral heterostructure capable of emitting multiple colors, providing a versatile material platform for developing complex integrated light-emitting devices [6]. Group 2 - The lateral heterostructures are significant for exploring exotic physical phenomena, developing new devices, and achieving miniaturization of equipment [5]. - The research utilizes a patterned template growth technique, which offers a feasible solution for large-area patterning of heterostructures [5]. - The synthesis method provides new insights into the structural characteristics of perovskites and enhances the understanding of their properties [6].