How does a P-N junction break down?

P-N junction is:

How does a gap junction facilitate intercellular communication?

With the help of a circuit diagram, explain the action of a N-P-N junction transistor.

What is maximum power rating of P-N junction diode?

Under what condition does a junction diode work as open switch?

How does the junction width change when a p-n junction is forward biased?

Zener diodes have the higher dopant densities as compared to ordinary p-n junction diodes. How does it affect the junction field?

Can two P-N junction diodes back to back works as P-N-P transistor?

Can the potential barrier across a p-n junction be measured by simply connecting a voltmeter across the junction?