Question

Use the web to find out what a "III-V" semiconductor is. How is this type of semiconductor related to silicon?

Answer 1

In a typical semiconducting material, we start with silicon (group IV) and introduce atoms of group V or group III depending on whether we are constructing an n- or p-type semiconductor respectively.

Types of dopants

There are two types of dopants used in doping the tetravalent Si or Ge.

1) Pentavalent (valency 5 ) atom : Arsenic(As), Antimony(Sb), Phosphorus(P).etc

2) Trivalent (valency 3 ) atom : Indium(In) , Boron(Br), Aluminium(Al).etc

N-Type Semiconducture :- doping pentavalent impurities phosphorus to germenium crystal

P- Type semiconducture : - Trivalent doping impurities.

The heavily n-type Si substrate was 500μm thick with 0.001-0.005Ω-cm resistivity.The III-V material consisted of heavily n-type (100) gallium arsenide (GaAs) substrate, 500nm n-type gallium indium phosphide (Ga0.5In0.5P) etch stop, and 25nm heavily n-type gallium indium nitride arsenide (GaInNAs) contact.