A Shockley diode is a PNPN device having two terminals as shown in fig. This device acts as a switch and consist of four alternate P-type and N-tpye layers in a single crystal.
WORKING OF SHOCKLEY DIODE
That Shockely diode behaves like a switch. So long as the forward voltage is less than breakover voltage, Shockley diode offers very high resistance (i.e., Switch is open ) and practically conducts no current.
At voltages above the break-over value, Shockley diode presents a very low resistance (i.e., Switch is closed ) and Shockley diode conducts heavily.
Note :- It may be noted that Shockley diode is also known as PNPN diode or four layer diode or reverse-blocking diode thyristor
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