JEE Main202125 Jul 2021Evening ShiftPhysicsSemiconductorsActual
In a semiconductor, the number density of intrinsic charge carriers at 27 ° C is 1 . 5 × 10 16 m - 3 . If the semiconductor is doped with an impurity atom, the hole density increases to 4 . 5 × 10 22 m - 3 . The electron density in the doped semiconductor is _______ × 10 9 m - 3
Correct answer
0
Step-by-step solution
n e n h = n i 2 n e = n i 2 n h = 1 . 5 × 10 16 2 4 . 5 × 10 22 = 1 . 5 × 1 . 5 × 10 32 4 . 5 × 10 22 5 × 10 9   m - 3