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There are several types of material which are used for different -2 circumstances in Electronics Engineering domain.Widely used semiconductors are-

Silicon - for diode ,solar cell, BJT etc.

germanium- for photo devices,and BJT for low level signal amplification.

GaAs(Gallium Arsenide)- for high frequency devices like tunnel diode Gunn diode.

InP & AlGaAs- for LED and others semiconductor material are also available like CdS,SiO2,GaP etc.

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Q: What are the four materials used in electronics?
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