Superlattice has unique performance advantages and the pace of research and application in my country is accelerating

Superlattice is a single crystal material composed of alternating thin layers of different materials. The thickness of these thin layers is generally between a few nanometers and tens of nanometers. Different thin layers grow alternately and are arranged repeatedly according to cycles. Simply speaking, superlattice A lattice is a specific form of layered composite material. Because it is composed of multiple materials stacked together, superlattice has special properties that ordinary materials do not have, and has broad development prospects in the field of semiconductor materials.

The concept of superlattice was proposed in the United States in the 1970s and is a milestone in the field of semiconductor physics. It has maintained high research interest since the 1980s until today. According to the type of heterojunction, superlattice can be divided into three types: first type superlattice, second type superlattice and third type superlattice, mainly based on the generation method of conduction band and valence band, and The difference can be distinguished by whether the band gap can be adjusted. According to the composition and properties, superlattice can be divided into doped superlattice, component superlattice, multidimensional superlattice, strained superlattice, etc.

According to the “Super Lattice Industry In-depth Market Research and Investment Strategy Suggestions Report 2021-2025” released by the Industrial Research Center, super The lattice has two important functions. First, because the superlattice is composed of stacks of different materials, it is used in the field of semiconductors. The conductivity of the material can be adjusted by changing the number of substances in the lattice; second, because a variety of materials are used , each layer of material in a superlattice has a different conductivity, meaning the superlattice can operate at different frequencies. In general, superlattice has the characteristics of adjustable conductivity, wide frequency adaptation range, fast response speed, and wide application range, so its research has attracted attention.

Perovskite is a crystal structure material. When perovskite nanocubes are combined with nanospheres of other materials, the resulting nanostructures can form a superlattice. Perovskite has excellent light absorption, electromagnetic, electrocatalytic and other properties. The series of products include conductors, semiconductors and insulators. It can be used as a substitute for crystalline silicon in the field of solar cells. The manufactured cells have the advantage of high photoelectric conversion efficiency. , in line with the development trend of solar cells, and has great market potential in the future.

Industry analysts said that research results related to superlattice in our country are constantly increasing. In January 2022, Fudan University scientists used carbon-coated Fe3O4 nanocubic superlattice as a precursor to prepare a 2D FeP nanoframe superlattice through a spatially confined topological chemical transformation strategy. The product has unique characteristics, and this transformation strategy can be used for the preparation of other superlattice. In the same month, scientists from Xiamen University, Guangdong University of Technology, and Suzhou University collaborated to develop a simple wet chemical method for superlattice synthesis of two-dimensional ruthenium multilayer nanosheets, which has a significant effect on enhancing electrocatalysis.

From the perspective of industrialization development, my country’s superlattice optoelectronic devices have achieved commercialization. AutoNavi Infrared masters the independent controllable R&D and production technology of Type II superlattice detectors. It has an 8-inch 0.5 micron Type II superlattice (T2SL) refrigerated infrared detector production line. The products mainly supply the needs of the military field and can be used for Ground combat vehicle fire control systems, high-end weapon targeting systems, air-ground attacks, etc. Overall, my country’s superlattice industry has good development prospects in the future.