SOLUTION

Doping of germanium with arsenic leads to N-type semiconductor.

N-type semiconductors are created by doping an intrinsic semiconductor with donor impurities.

As shown in the figure, each of the four out of five valency electrons of impurity says of Arsenic enters into covalent bonds with Germanium, while the fifth valence electron is set free to move from one atom to the other. The impurity is called donor impurity as it donates an electron and the crystal is called an N-type semiconductor