Question

The electrical conductivity of pure germanium can be increased by

• A. increasing the temperature
• B. doping acceptor impurities
• C. doping donor impurities
• D. all of the above

Answer 1

Answer: (D)

all of the above

As the temperature increases, the thermal motion of electrons also increases which results in increasing of the conductivity of the Ge crystal.

Also as the conductivity of extrinsic semiconductor is more than that of intrinsic semiconductor, thus the conductivity of pure germanium increases by doping Ge crystal either with acceptor impurities or the donor impurities.