Extrinsic Semiconductors
There are 02
types
1 N typesemiconductor
Containsdopantsthathave extra electrons than theoriginalatom
If we replaceoneofthe Siatoms in our latticewith a phosphorous atomtherewillbe an
extra electronfloatingaround
This is because Phosphorous has 03electrons in its outershell Silicononlyha
two
In a Si latticethereis no where forthisextra electron to bond to so it is free
tomove aboutthe lattice
Extra electron is floating around the lattice Veryeasy tojumpintothe conductionband at it
when an electricfield is applied
Theextra electronshave an energylevel called the donorstate in thebandgap nearthe
edge oftheconduction band
At rtp whenthe extraelectronjumpsintothe conduction band theydonot leavebehinda
holes Theonlycharge carriers is an extrinsic n type semiconductor are electrons
n type semiconductors extra charge carriers electrons withE ve charge
2 P type semiconductor
Thedopant atom has one lesselectronthanthe intrinsic semiconductor
There are 02
types
1 N typesemiconductor
Containsdopantsthathave extra electrons than theoriginalatom
If we replaceoneofthe Siatoms in our latticewith a phosphorous atomtherewillbe an
extra electronfloatingaround
This is because Phosphorous has 03electrons in its outershell Silicononlyha
two
In a Si latticethereis no where forthisextra electron to bond to so it is free
tomove aboutthe lattice
Extra electron is floating around the lattice Veryeasy tojumpintothe conductionband at it
when an electricfield is applied
Theextra electronshave an energylevel called the donorstate in thebandgap nearthe
edge oftheconduction band
At rtp whenthe extraelectronjumpsintothe conduction band theydonot leavebehinda
holes Theonlycharge carriers is an extrinsic n type semiconductor are electrons
n type semiconductors extra charge carriers electrons withE ve charge
2 P type semiconductor
Thedopant atom has one lesselectronthanthe intrinsic semiconductor
