Question

A silicon specimen is made into a `P`-type semiconductor by dopping, on an average, one helium atoms per `5xx10^(7)` silicon atoms. If the number density of atoms in the silicon specimen is `5xx10^(28) at om//m^(3)` then the number of acceptor atoms in silicon per cubic centimeter will be

Answer 1

No density of silicon `=5xx10^(28) "atoms"//m^(3)`
`=5xx10^(22) "atoms"//cm^(3)`.
No. of acceptor `"atoms"//cm^(3) =5xx10^(22)//(5xx10^(7))`
`=10^(15)//cm^(3)`