Name: Energy Band Gap
Uploaded: 2019-07-19
Duration: 5 min 21 s
Description: We know that certain materials conduct electricity whereas some don’t. Has it got anything to do with their energy bandgap? Let’s find out in this video.

Question

What is

p n

-junction diode? Draw the characteristic curve of a

p n

-junction diode in the forward and reverse bias.

Accepted Answer

When we join p type and n type semiconductors together, pn jn diode is formed. It allows current to flow in forward bias(ie when p connected to positive and n connected to negative) and stops current through it in reverse bias.so it works like a valve.This pn diode is very useful for various useful operations.

Here in this diode we can control current by varying the output voltage.

Now P-type semiconductor is obtained by adding impurity of pentavalent atom in the pure semiconductor(say Si). So there we get enough free electrons which can flow if potential difference is applied.

N-type semiconductor we get by adding impurity of trivalent atoms in pure semiconductors. So there will be deficiency of electrons called holes.which move when potential difference is applied.

Or

A p-n junction diode is two-terminal or two-electrode semiconductor device, which allows the electric current in only one direction while blocks the electric current in opposite or reverse direction. The p-n junction, which is formed when the p-type and n-type semiconductors are joined, is called as p-n junction diode.

What is $p n$ -junction diode? Draw the characteristic curve of a $p n$ -junction diode in the forward and reverse bias.

Important Questions on Electronic Devices

Learn and Prepare for any exam you want !

What is pn -junction diode? Draw the characteristic curve of a pn -junction diode in the forward and reverse bias.

Important Questions on Electronic Devices

Learn and Prepare for any exam you want !

What is $p n$ -junction diode? Draw the characteristic curve of a $p n$ -junction diode in the forward and reverse bias.