In an intrinsic semiconductor at room tempera | vedclass

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(A) In an intrinsic semiconductor,the charge carriers are generated due to the thermal excitation of electrons from the valence band to the conduction

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(A) In an intrinsic semiconductor,the charge carriers are generated due to the thermal excitation of electrons from the valence band to the conduction band.When an electron is excited to the conduction band,it leaves behind a vacancy in the valence band,which is called a hole.Since each electron-hole pair is created simultaneously,the number of free electrons $(n_e)$ in the conduction band is exactly equal to the number of holes $(n_h)$ in the valence band.Therefore,$n_e = n_h$ at any given temperature,including room temperature.

In an intrinsic semiconductor at room temperature,the number of electrons and holes are:

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