The conductivity of intrinsic semiconductors, such as silicon and germanium, can be increased
when small amounts of group 3A or group 5A elements are added, a process called doping. The
resulting semiconductors are called either p-type or n-type semiconductors. Classify the type of
doping condition and diagrams depicting the electron population of molecular orbital energy-
level bands as p-type or n-type semiconductors. p-type semiconductors n-type semiconductors
Solution
Band diagram Ge doped with Al represents p - type semiconductor. As Al has only 3 electrons in
its valence shell so it provides holes as majority carrier in intrinsic Ge.
Band diagram Ge doped with Sb represents an n - type semiconductor. As Sb has five e\'s in its
valence shell so it provides e\'s as majority carrier in intrinsic Ge.
when small amounts of group 3A or group 5A elements are added, a process called doping. The
resulting semiconductors are called either p-type or n-type semiconductors. Classify the type of
doping condition and diagrams depicting the electron population of molecular orbital energy-
level bands as p-type or n-type semiconductors. p-type semiconductors n-type semiconductors
Solution
Band diagram Ge doped with Al represents p - type semiconductor. As Al has only 3 electrons in
its valence shell so it provides holes as majority carrier in intrinsic Ge.
Band diagram Ge doped with Sb represents an n - type semiconductor. As Sb has five e\'s in its
valence shell so it provides e\'s as majority carrier in intrinsic Ge.
