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In an SCR with four layers represented as shown in the given figure, which are the layers that are equally doped?

In an SCR with four layers represented as shown in the given figure, which are the layers that are equally doped? Correct Answer P<sub>1</sub> and P<sub>2</sub>

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Construction:

  • The SCR is a four layer and three-terminal device.
  • The four layers made of P and N layers, are arranged alternately such that they form three junctions J1, J2 and J3.
  • These junctions are either alloyed or diffused based on the type of construction.

 

Doping level:

  • The level of doping varies between the different layers of the thyristor.
  • The cathode (N2) is the most heavily doped. The gate and anode (P1 and P2) are the next heavily doped.
  • The lowest doping level is within the central N type layer. This is also thicker than the other layers and these two factors enable a large blocking voltage to be supported.
  • Thinner layers would mean that the device would break down at lower voltages.

Related Questions

Consider the following statements: 1. In a silicon controlled rectifier (SCR), if the cathode gate is reverse-biased, then the SCR cannot fire at all. 2. The turn-on time of an SCR increases with temperature. 3. After an SCR is turned on, it can be made to turn off again by reverse biasing the gate. 4. Gate recovery time is the minimum time that the anode voltage must be maintained below holding voltage VH to turn off the SCR. Which of these statements are correct?
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