Explanation

superlattice materials is an artificial periodic materials, which superimposes an artificial period on the lattice structure of the original natural crystal. The thickness of the potential well region in this periodic structure is usually smaller than the average free path of electrons, and the barrier region is narrow enough to couple the electron wave functions in adjacent potential wells. This materials is called superlattice materials. superlattice materials can be divided into two categories: component superlattice: this kind of superlattice is a periodic structure formed by different semiconductor film materials. Usually represented by 'ABABAB...'. Among them, the letter A represents one type of semiconductor, such as GaAs, while the letter B represents another type of semiconductor, such as AlGaAs. Doping superlattice: This superlattice is composed of the same semiconductor materials, but the films with different doping types are alternately and repeatedly formed. For example, it can be composed of n-type Si (carrier doped), p-type Si (positive carrier doped), and intrinsic i-layer Si, forming a structure of "nipinipi...". The preparation methods of superlattice materials include molecular beam epitaxy, organic metal compound vapor phase epitaxy, etc. These methods are used to grow the required periodic structures on thin film materials to achieve the specific properties and applications of superlattice.

Classification