Types of semiconductors

1. n-type semiconductor
   • Silicone (4 valence electrons) is doped with pentavalent atoms such as antimony, phosphorus or arsenic to increase the number of free electrons.
   • 
   • This silicone has electrons as the majority charge carrier.
     
      
2. p-type semiconductor
   • Silicone is doped with trivalent atoms such as boron, indium and gallium which have more positive holes.
   • 
   • This silicone has a positive hole as the majority charge carrier.

The diode works in two ways:

1. Forward-biased
   • 

   • The depletion layer shrinks, R decreases

   • The junction voltage decreases

   • The supplied V is higher than the junction voltage

   • Current flows
     
      

2. Reverse-biased

   • 

   • The depletion layer thickens, R increases

   • The junction voltage increases

   • The supplied V is lower than the junction voltage

   • Current does not flow

Types of semiconductors

1. n-type semiconductor
   • Silicone (4 valence electrons) is doped with pentavalent atoms such as antimony, phosphorus or arsenic to increase the number of free electrons.
   • 
   • This silicone has electrons as the majority charge carrier.
     
      
2. p-type semiconductor
   • Silicone is doped with trivalent atoms such as boron, indium and gallium which have more positive holes.
   • 
   • This silicone has a positive hole as the majority charge carrier.

The diode works in two ways:

1. Forward-biased
   • 

   • The depletion layer shrinks, R decreases

   • The junction voltage decreases

   • The supplied V is higher than the junction voltage

   • Current flows
     
      

2. Reverse-biased

   • 

   • The depletion layer thickens, R increases

   • The junction voltage increases

   • The supplied V is lower than the junction voltage

   • Current does not flow