09: Semiconductors

A material with a resistivity between that of a good conductor and a good insulator.

Positively charged gaps or spaces which are created

when an electron breaks free from a covalent bond

The movement of charges through a pure semiconductor

with an equal number of electrons and holes

the addition of impurities in a semiconductor

to increase its conductivity

A semiconductor whose resistance decreases rapidly with increasing temperature.

a semiconductor whose conductivity is increased when light shines on it.

A semiconductor in which electrons are the majority charge carriers

a semiconductor in which positive holes are the majority charge carriers

The movement of charges through a doped semiconductor

with an unequal number of electrons and holes

The region connecting a P-type semiconductor to an N-type semiconductor

the region at both sides of a P-N
junction

that contains no free majority charge carriers

*The p.d. that exists across a p-n junction

caused by holes and electrons moving across the junction when it was formed

**(Not sure if this is a definition or not)**

*A forward biased p-n junction conducts current.
A reverse biased p-n junction does not conduct current.

**I don't understand what this means**

A device that allows current to flow in one direction only

A device that converts A.C. to D.C.