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  • (a) How are energy bands formed in a crystalline solid (b) Draw the energy band diagrams for p-type and n-type semiconductors. Depict the donor/acceptor energy levels in these diagrams and write their significance.

(a) How are energy bands formed in a crystalline solid ?

(b) Draw the energy band diagrams for p-type and n-type semiconductors. Depict the donor/acceptor energy levels in these diagrams and write their significance.

 

 
 
 
 
 

Answers (1)

a) Isolated atoms have discrete energy levels. In a crystalline solid, due to the presence of a large number of atoms, interatomic interactions take place. Due to this, energy levels get modified to energy bands.

b) The energy band diagram of n-type, Semiconductor
at temperature (first figure on the left side)

The energy band diagram of p-type, Semiconductor
at temperature  (second figure on right)

c)

The number of electrons/ holes per unit volume increases

Posted by

Safeer PP

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