Review:
As a representative of the second generation semiconductor materials, GaAs solar cell has many characteristics different from Si and Ge materials, which can be widely used in light-emitting devices (lasers, light-emitting diodes), photodetectors (photodetectors) and high-frequency devices. In order to make full use of its inherent semiconductor characteristics, improve the integrity of its crystal materials, optimize the production process, and reduce the production cost, Researchers at home and abroad have developed different types of special equipment for the production of GaAs single crystal materials. The development history of GaAs crystal growth equipment is reviewed and summarized, including the synthesis equipment and crystal growth equipment of GaAs solar cell materials. The performance characteristics of mature VB and VGF single crystal furnaces are mainly introduced, and the representative equipment types in the industry are compared, The future development trend of GaAs single crystal furnace is prospected.
III - V compound semiconductor GaAs solar cell materials. It has some properties superior to silicon and has become an important semiconductor material next only to silicon.H. The compounds of group Ⅲ - Ⅴ proposed by welke in 1952 have excellent semiconducting properties. At that time, we speculated that gallium arsenide had the advantages of both silicon and germanium from the band gap and electron mobility, so we carried out the research on compound semiconductor materials such as gallium arsenide.Little progress was made in the first 10 years. Since the advent of GaAs laser in 1962, GaAs devices have developed rapidly. Although the idea of substituting gallium arsenide for silicon and germanium has not been realized,it has shown excellent performance in laser, luminescence and microwave. Gallium arsenide has been used to manufacture high-speed integrated circuits, which puts forward higher requirements for the quality of materials, and promotes the further research of GaAs solar cell materials.
The research topics of GaAs solar cell Materials include: the preparation of low dislocation, large diameter, undoped, semi insulating GaAs single crystals; Elucidation and control of deep level defects; The formation of oxide layer with low interface state density.