Explanation: The mentioned symbol is the symbol for metal semiconductor diode or Schottky diode. 4. How the ohmic contact is formed in metal semiconductor diode? (AL-Aluminium)
A. n+ diffusion in p-region near AL lead
B. p+ diffusion in p-region near AL lead
C. n+ diffusion in n-region near AL lead
D. p+ diffusion in n-region near AL lead
Answer:A
Explanation: The mentioned symbol is the symbol for metal semiconductor diode or Schottky diode. 4. How the ohmic contact is formed in metal semiconductor diode? (AL-Aluminium)
A. n+ diffusion in p-region near AL lead B. p+ diffusion in p-region near AL lead C. n+ diffusion in n-region near AL lead D. p+ diffusion in n-region near AL lead
Explanation: Aluminium is p-type impurity in silicon. So, when it is used to make a contact with n-type silicon, its essential contact is ohmic and no PN-junction is formed. Therefore, the contact is done by making n+ diffusion in the region near the surface where aluminium is deposited.