Q:
      
      
         
            
When a piece of pure silicon is doped with aluminium, then
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: C) the doped silicon piece will become p-type         
         
Explanation: p type of semiconductor is obtained when Silicon is doped with a trivalent impurity like Aluminium. Aluminium is a p-type dopant, which means that when a semiconductor i.e. silicon is doped with aluminium, it creates a hole (positively charged carrier) by accepting an electron from the silicon atom. Electrical conductivity of semiconductors increasesand resistivity remains the same
       
      
      
      
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