Practicing Success
A pure semiconductor germanium or silicon, free of every impurity is called intrinsic semiconductor. At room temperature, a pure semiconductor has very small number of current carriers (electrons and holes) .Hence its conductivity is low. When the impurity atoms of valance five or three are doped in a pure semiconductor, we get respectively n- type or p- type extrinsic semiconductor. In case of doped semiconductor ne.nh = ni2. Where ne and nh are the number density of electron and hole charge carriers in a pure semiconductor. The conductivity of extrinsic semiconductor is much higher than that of intrinsic semiconductor. |
Which of the following statements is not true? |
The resistance of intrinsic semiconductor decreases with increase of temperature .Doping pure Si with trivalent impurities gives p- type semiconductors The majority charge carriers in n- type semiconductors are holes. A p-n junction can act as semiconductor diode. |
The majority charge carriers in n- type semiconductors are holes. |
$\text{The majority charge carriers in n- type semiconductors are electrons.}$ |