新型半导体材料，重要进展

Core Viewpoint - The research team from the University of Science and Technology of China, in collaboration with Purdue University and ShanghaiTech University, has made significant advancements in the field of new semiconductor materials by achieving controllable construction of "mosaic" heterojunctions in two-dimensional ionic soft crystal materials, paving the way for the development of high-performance optoelectronic and integrated devices [1][2]. Group 1 - The ability to precisely construct heterostructures laterally within the material plane is crucial for exploring novel properties, developing new devices, and promoting device miniaturization [1]. - Traditional techniques like photolithography often damage the soft and unstable crystal structures of ionic soft lattice semiconductors, making high-quality lateral heterointegration challenging [1][2]. Group 2 - The research team proposed an innovative method of guided crystal internal stress "self-etching," utilizing the naturally accumulated internal stress during the growth of two-dimensional perovskite single crystals [2]. - By designing a mild ligand-solvent microenvironment, the team activated and utilized these internal stresses to achieve controlled "self-etching," resulting in the formation of regular square hole structures [2]. Group 3 - The new processing method allows for the precise backfilling of different semiconductor materials, ultimately constructing high-quality "mosaic" heterojunctions with atomically flat interfaces within a single chip [2]. - This approach signifies a shift from "stitching" different materials to guiding the crystal to perform precise "self-assembly," enabling the potential to "grow" densely arranged micro-pixel points that emit different colors of light on a thin material [2]. Group 4 - The research represents the first successful construction of high-quality, designable lateral heterojunction structures in two-dimensional ionic material systems, breaking through the limitations of traditional processes [2]. - The new paradigm of controlling crystal internal stress and dynamics provides a platform for studying idealized interface physics and opens new pathways for the integration and device fabrication of low-dimensional materials [2].