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A semiconductor is known to have an elec...

A semiconductor is known to have an electron concentration of `5xx10^(12) cm^(-3)` and a hole concentration `8xx10^(13)cm^(-3) ` Is the semi-conductor n-type or p-type? What is the resistivity of the sample, if the electron mobility is `23,000 cm^(2) V^(-1)s^(-1)`? Take charge on electron, `e=1.6xx10^(-19) C`.

Text Solution

Verified by Experts

The correct Answer is:
`3.40`
As `mu_e=23,000 cm^2 //Vs,mu_h=100cm^2//Vs`
`sigma =e(n_emu_e+n_hmu_h)`
`=(1.6xx10^(-19))[(8xx10^(13))(23,000) + (5 xx 10^(12))x100]`
` = 0.29448//Omega cm`
Thus, `rho=1/sigma=1/(0.29448//Omegacm)~~3.40Omegacm`
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