GaAs is an example of the so-called \"III-V\" class of semiconductor, due to the
ID: 2219314 • Letter: G
Question
GaAs is an example of the so-called "III-V" class of semiconductor, due to the columns in the periodic table of Ga and As, respectively. GaAs has a similar crystal structure to silicon (i.e.. zincblende) except that half of the Si atoms are replaced by Ga atoms and the other half by As atoms. The structure is such that every Ga atom is bonded to 4 nearest neighbor As atoms; and every As atom is bonded to 4 nearest neighbor Ga atoms. In GaAs crystals, silicon atoms are used as dopants. If the silicon dopant atoms replace Ga atoms in the crystal, would silicon be an N or P type dopant? What if the silicon atoms replaced As atoms in the crystal? Explain your answer.Explanation / Answer
Crystal st of Silicon is FCC and Ga will be at corners and As will be at tetrahedral void In preodic table Ga is in 3A and As is in 5A. Silicon can bond with 4 atoms only and if Si is replaced by Ga the 1 bond will be vacant means 1 bond is free and this will accept electrons so this will be p-type. If Si is replaced by As the 1 electron of As will be free then this will be n-type.
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