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A semiconductor is known to have an elec...

A semiconductor is known to have an electron concentration of `6xx10^(12)` per cubic centimeter and a hole concentration of `8xx10^(13)` per cubic centimeter. Is this semiconductor N-type or P-type ?

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(i)`n_(e) =5xx10^(12)cm^(-3)=5xx10^(18)m^(-3)``n_(e) =5xx10^(12)cm^(-3)=5xx10^(18)m^(-3)`` u_(e) =23000cm^(-2)v^(-1)s^(-1)=2.3m^(-2)v^(-1)s^(-1)` ` u_(e) =23000cm^(-2)v^(-1)s^(-1)=2.3m^(-2)v^(-1)s^(-1)`` u_(e) =100cm^(-2)v^(-1)s^(-1)=0.01m^(-2)v^(-1)s^(-1)` Since the semiconductor has greater hole density hence it is p-type.(ii)`n_(e) =5xx10^(12)cm^(-3)=5xx10^(18)m^(-3)` `n_(e) =5xx10^(12)cm^(-3)=5xx10^(18)m^(-3)` ` u_(e) =23000cm^(-2)v^(-1)s^(-1)=2.3m^(-2)v^(-1)s^(-1)` ` u_(e) =23000cm^(-2)v^(-1)s^(-1)=2.3m^(-2)v^(-1)s^(-1)` ` u_(e) =100cm^(-2)v^(-1)s^(-1)=0.01m^(-2)v^(-1)s^(-1)` Now `((1)/(p))=e((n_(e)u_(e)+n_(h)u_(h)) =1.6xx10^(-19)[5xx10^(18)xx2.3+8xx10^(19)xx0.01]`=`1.6xx10^(-19)[1.15xx10^(19)xx2.3+0.08xx10^(19)]=1.968` or `rho =((1)/(1.968))=0.508 Omega -m`
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