SEMICONDUCTOR DIODE

Every known element has:

• The same type of atom 

• The same number of atom 

• A unique type of atom 

• Several different types of atom 

An atom consists of : 

• One nucleus, and only one electron 

• One nucleus and or more electrons 

• Protons, neutrons and electrons 

The nucleus of an atom is made up : 

• Protons and neutrons 

• Electrons 

• Electrons and protons 

• Electron and neutron 

Valence electrons are 

• In the closest orbit to the nucleus 

• In the most distant orbit from the nucleus 

• In various orbits around the nucleus 

• Not associated with a particular atom 

 

The most widely used semiconductive material in electronic devices is: 

• Germanium 

• Carbon 

• Copper 

• Silicon 

The energy band in which free electrons exist is the : 

• First band 

• Second band 

• Conduction band 

• Valence band 

Electron-holes pair are produced by

• Recombination

• Thermal energy 

• Ionization 

• Doping 

Recombination is when

• An electron falls into a hole 

• A positive and a negative ion bond together 

• A valence electron becomes a conduction electron 

• A crystal is formed 

Each atom in silicon crystal has

• Four valence electrons 

• Four conduction electrons 

• Eight valence electrons,four of its own and four shared

• No valence electrons because all are shared with other  atoms 

The current in a semiconductor is produced by : 

• Electron only 

• Holes only 

• Negative ions 

• Both electrons and holes