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Semiconductor materials

2019-01-13 10:15 View:
Semiconductor materials, semiconductor material) is a kind of has a semiconductor performance (conductive ability between conductor and insulator, resistivity around 1 m Ω Ω · · cm ~ 1 g cm range), can be used for production of semiconductor devices and integrated circuits of electronic materials.

 
1, Main types of semiconductor materials
 
Semiconductor materials can be classified according to chemical composition, and amorphous and liquid semiconductors with special structure and performance are classified separately. According to this classification method, semiconductor materials can be divided into elemental semiconductor, inorganic compound semiconductor, organic compound semiconductor and amorphous and liquid semiconductor.

 

2, Inorganic compound semiconductor: divided into binary system, ternary system, quaternary system, etc.Binary system include: (1) Ⅳ - Ⅳ clan: SiC and Ge - Si alloy with zinc blende structure.(2) Ⅲ - Ⅴ race: In the periodic table Ⅲ element Al, Ga, In composition P, As, Sb and V elements, a typical representative of GaAs.All of them have sphalerite structure, and they are second only to Ge and Si in application.(3) Ⅱ - Ⅵ clan: Ⅱ group elements zinc, Cd, Hg and Ⅵ group element S, Se and Te form compounds, are some important photoelectric materials.ZnS, CdTe and HgTe have sphalerite structure.(4) Ⅰ - Ⅶ clan: Ⅰ group elements Cu, Ag, Au and Ⅶ element Cl, Br, I form compounds, including CuBr, CuI with zinc blende structure.(5) Ⅴ - Ⅵ clan: Ⅴ group elements As, Sb, Bi and Ⅵ element S, Se and Te in the form of compounds formed have, such As Bi2Te3, Bi2Se3, Bi2S3, As2Te3 thermoelectric materials is important.The fourth cycle of B and transition elements Cu, Zn, Sc, Ti, V, Cr, Mn, Fe, Co, Ni oxide, as the main thermistor materials.All landowners 
certain rare earths element Sc, Y, Sm, Eu, Yb, Tm and Ⅴ group elements N, As or Ⅵ group element S, Se and Te form compounds.In addition to these binary system compounds, there are solid solution semiconductors between them and elements or between them, such as si-alp, ge-gaas, InAs-InSb, AlSb-GaSb, InAs-InP, GaAs-GaP, etc.The study of these solid solutes can play an important role in improving some properties of a single material or opening up new application areas.


 
 
3, Organic compound semiconductor: there are dozens of known organic semiconductor, known as naphthalene, anthracene, polyacrylonitrile, phthalocyanine and some aromatic compounds, etc., they have not been used as semiconductors.


 
 
4, Amorphous and liquid semiconductors: the biggest difference between such semiconductors and crystalline semiconductors is that they do not have a strictly periodic arrangement of crystal structures.

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