What Is a Superlattice?

In 1970, Ezaki and Zhu Zhaoxiang of the IBM Laboratory in the United States proposed the concept of superlattice. They envisage that if two periodic materials are used to grow the periodic structure alternately, and the thickness of each layer is below 100nm, as shown in the figure, the movement of electrons in the growth direction will oscillate, which can be used to make microwaves. Device. Their vision was realized two years later on a molecular beam epitaxy device.

Superlattice

In 1970, Ezaki and Zhu Zhaoxiang of the IBM Laboratory in the United States proposed the concept of superlattice. They envisage that if two periodic materials are used to grow the periodic structure alternately, and the thickness of each layer is below 100nm, as shown in the figure, the movement of electrons in the growth direction will oscillate, which can be used to manufacture microwave Device. Their vision was two years later in a

Superlattice material

If the superlattice is composed of two semiconductor materials with different band gaps, each quantum well will form a new selection rule that affects the movement of charges in this structure. These two semiconductor materials are deposited alternately along a specific growth direction with a certain period. Since Ezaki and Zhu Zhaoxiang proposed this method of synthesizing superlattices in 1970, a great deal of research has been done on the physical mechanism of this ultrafine semiconductor. After the concept of quantum confinement was proposed, quantum effects have been observed from isolated quantum well heterojunctions, which are closely linked to the superlattice through the tunneling phenomenon. So these two physical concepts are discussed on the same physical basis, but they have different applications in electronics and optical equipment.

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Superlattice materials are currently used to make high-performance infrared focal plane imaging arrays. ^[1]