Doped Semiconductors

1.   These are the materials in which carrier of one type (holes or electrons) predominate.
2.   Doped silicon wherein the majority of charge carriers are negatively charged electrons is known as n type.
3.   When silicon doped so that majority of charge carriers are positively charged holes is known as p type.
4.   Doping of silicon to turn it into n type or p type is attained by a small number of impurity atoms.
5.   For example, introducing impurity atoms of a penta -valent element like phosphorus produce in n type silicon.

No Bias