CRO and semiconductor

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 characteristics of p-type semiconductors is includes

• Majority carriers are holes

• Has tendency to gain electron

• Has tendency to donor electron

• Easy to conduct electricity

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

• Doping

• Ionization

• Recombination

• Atomic modification

Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of

• diode

• semiconductor

• conductor

• insulator

• superconductor

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 current in a semiconductor is produced by

• electron only

• holes only

• negative ions

• both electrons and holes

Hole is

• an anti-particle of electron

• a vacancy created when an electron leaves a covalent bond.

• absence of free electrons.

• an artifically created particle

what is thermionic emission

• the emission of electron when surface of metal cold down

• the emission of proton when surface of metal get heated

• the emission of electron when surface of metal get heated

• the emission of negatively ion when surface of metal get heated

what is a cathode ray

• the emission of electron when surface of metal get heated

• a beam of fast moving electron

• the emission of negatively when surface of metal get heated

• the emission of light

the conductivity of semiconductor increase when

• its temperature increase

• its temperature decrease

• it is moving in high velocity

• the current applied increase