Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.

1. Chapter2
If a piece of Ptype material isjoinedtoapiece of N type material suchthat the crystal structure remains
continuousatthe boundary,a PN junctionisformed.
Thisis calledaSemiconductorDiode
Special fabricationtechniquesare neededto forma PN junction.
All semiconductordevicescontainatleastone PN junction.
JunctionTheory:
P-N junctionhasthe abilitytoconductcurrent inone directiononly.Inthe reverse direction,itoffers
highresistance.
PN junctionwithnoexternal bias:
Diagram
Its lefthalf isPtype and righthalf is N type.
P type has holesandnegativelychargedimpurityions.N regionhase-
s&+velychargedimpurityions.
(Minoritychargesare not shown.)
Holes& e-
sare mobile charge carriers,butionsare immobile.