When Arsenic atoms are added to Germanium lattice, it becomes a/an

When a pentavalent (donor) impurity, like arsenic, is added to germanium, it will form covalent bonds with the germanium atoms, leaving 1

electron relatively free in the crystal structure.

Pure germanium may be converted into an N-type

semiconductor by “doping” it with any donor impurity having 5 valence electrons in its outer shell.

Semiconductors which are doped in this manner

- either with N- or P-type impurities - are referred

to as EXTRINSIC semiconductors.