Question

Number of Materials in PNP Transistor
PNP transistor consists of how many materials?

Answer 1

P- type semiconductor

N-type semiconductor 

A semiconductor Si / Ge is doped with atoms of another element like Ga that contains less electrons to make it a P-type semiconductor.

A semiconductor Si /Ge is doped with atoms of another element like P that contains more electrons to make it a N-type semiconductor.

So there are 3 materials :   Ga, Si, P    for example.