A silicon sample is doped with phosphorus at 5 parts in 106. Phosphorus acts as

Question

A silicon sample is doped with phosphorus at 5 parts in 106. Phosphorus acts as an electron donor, providing one free electron per atom. The density of silicon is 2.33 g/cm3, and its atomic mass is 28.09 g/mol. Calculate the number of free (conduction) electrons per unit volume of the doped silicon. ne,Si = electrons/cm3 Compare the result from part (a) with the number of conduction electrons per unit volume of copper wire (assume each copper atom produces one free (conduction) electron). The density of copper is 8.96 g/cm3, and its atomic mass is 63.54 g/mol. ne,Si/ne,Cu

Explanation / Answer

a.2.33*10^6g/cm3 b.(8.96*10^6*5)/(5*63.54)g/mol

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