Semiconductor Physics

A semiconductor has generally ……………… valence electrons.

• 2

• 3

• 6

• 4

The forbiddenn energy gap for Germanium is of the order of

• (a) 0.7 eV

• (b) 0.3 eV

• (c) 1.1 eV

• (d) 10 eV

Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?

• Boron

• Arsenic

• Indium

• Gallium

Doping of Semiconductors

• materials which can conduct electricity better than insulator, but not as well as conductors.

• The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.

• when 4 electrons in outermost orbit.

The process of adding an impurity to an intrinsic semiconductor is called

• Doping

• Ionization

• Recombination

• Atomic modification

The minority carriers in P-type silicon are called _________________

• Neutron

• Proton

• Electron

• Hole

During formation of p-n junction

• an electron diffuses from n to p side

• a hole diffuses from p to n side

• a hole diffuses from n to p side

• an electron diffuses from p to n side

Which is not one of the properties of semiconductor?

• 4 electrons in outermost orbit, in covalent bonding.

• atoms vibrate causes electron to break free from the bonds.

• Electron free leaves hole.

• Semiconductor has 2 types of charge carriers.

• all of the above are the properties of it

Which among these is NOT a semiconductor

• Germanium

• Silicon

• Gallium Arsenide

• Titanium

Electrons and holes are equal in magnitude but opposite in polarity

• True

• False